E762/E765/E768 Retro Tube - ENGL Guitar Amplifiers

E762/E765/E768Retro Tube

Operator´s Manual

Table of Contentspage

IntroductionFeatures and Functionality at a Glancespecial notes, ContentsFront Panel Features:

Rear Panel Features:

TroubleshootingTechnical Data,Tube Map, Tube Exchange Service

Wiring of Principal Connectors

Note:

:

Handling and Care

Preamp section: Input, Channel 1 - Control FeaturesPreamp section: Channel 2 - Control FeaturesGain Boost, Channel 1< >2 selectionPower Amp section: Master A and Master A/B feature, Stand By

(P.T.F.)

(P.T.F.)Noise Gate: Threshold LevelFX Loop: Send, Return, and BalancePower Amp section: Power Tube Fuse (P.T.F.)Power Amp section: Poweramp Output 4, 8 16 OhmsPoweramp Output: speaker options

Power switch

Mains connector (AC Power Inlet), Mains FuseAmp remote control: S.A.C. Port for Z-9, Footswitch Ports

Detailed Specifications and Ratings

You'll find an ancillary pamphlet accompanying this owner's manual entitledInstructions for the Prevention of Fire, Electrical Shock and Injury.Be sure to read it before you plug in and power up the amp!

Technical specifications are subject to change without notice.

Power Amp section: Power Tube FusePower Amp section: Master B controlPower Amp section: Power Tube Fuse LED

Remote Control Options

Configuration table for Z-9 settingsMounting Instructions: front panel frame

CAUTION! Please read and heed the following:

456

6, 78, 999, 1010

1111, 12131313, 1414, 151515, 161616

1718, 19202122222324 - 26

3

Congratulations and thank you for choosing the ENGL Retro Tube amp!It's all in the name: The Retro Tube line is a new generation of ENGL amps that dips intoa deep well of classic sounds. Plug in and you will be able to pull up the typical tones ofthe iconic guitar heroes who wrote the book on rock. Offering four different gainstages in two channels and brimming with trademark ENGL features, the Retro Tubeoffers a vast range of spine-tingling tones. The amp's visuals are certainly striking andstylish enough as it is, but the interchangeable front-panel frames add an entirely newtwist. The different colors let you tweak the Retro Tube amp's look to taste.Painstakingly selected EL34 power tubes underscore the amp's retro flavors andprovide all the juice you need to dial up the sound pressure.Preamp Channel 1 is tuned to deliver warm, organic clean sounds that break upbeautifully when you dial in higher gain levels. A twist of the wrist is all it takes toconjure luscious harmonic overdrive .This channel's Gain Boost option not only increases amplitude, it also adapts frequencyresponse to create a unique tonal structure perfect for sweet chord progressions andsanctified rock riffs.Channel 2 extends the amp's tonal spectrum with two far more aggressive gainstructures than Channel 1. It does everything you want it to do when it comes tooverdrive, saturation and all-out distortion: the Gain Boost option inserts an additionaltriode tube into the signal path to create an extremely thick sound structure with daysof sustain and a rich overtone spectrum perfect for soaring leads.The built-in Noise Gate helps stifle the annoying hiss often generated when Gain Boostis engaged at very high gain levels. Channel 2's Tone button fattens up the sound inboth Gain stages. It enriches the midrange frequencies, effectively doubling thenumber of basic sounds available to you in Channel 2.Footswitches let you conveniently access the various setups so can mix it up for rhythmand leads on the fly.Other trademark ENGL features include a second master volume (Master A/B), apower tube protection circuit with an LED display (P.T.F.), and an adjustable,switchable FX loop (parallel/ serial).There are few more handy features to rave about: The Retro Tube amp sports ourSerial Amp Control Port, or S.A.C. Port for short.Plug an ENGL Z-9 Custom Foot Controller into to it and get hip to some very convenientremote control options. This footboard lets you activate the two channels directly incombination with Gain Boost and Master A/B switching simply by tapping its fourfootswitches. And that affords you instant access to four sound variations at twodifferent volume levels each. Moreover you can access further prominent features like

and ; the build in Noise Gate is switchable via footswitch too.In addition, the amp comes with three stereo jacks designed to accept dualfootswitches like the ENGL Z-4 or a MIDI switching system (e.g. ENGL Z-11) forselecting the channels and other crucial Amp features.Old world craftsmanship and highest quality components are part of what makesENGL amps so special, and the Retro Tube Amp is no exception. On that note, pleaseread and heed the guidelines on handling all-tube amps. The ENGL team is convincedthat this amp will delight and inspire you.

Tone FX Loop off/on

4

Your ENGL Retro Tube Amp puts at your disposal:

Features and Functionality at a Glance

1. a logical control feature array, utmost and;

2. and with two channelsand different voicings. Channel 1 features a Bright sound switch; Channel 2features the Tone sound option for a precise sound tuning of mid frequencies.

3. : s are at yourfingertips, and a tap of your foot on the conveniently compact footboard.This gives you very .

5. An that will give you years ofand .

-> : withseparate Gain and Volume knobs.

-> . You can control the remotely viaa footswitch and use this circuit as a hardware bypass for connected FX.

ease of use remarkably intuitivehandlingTop-shelf sound-shaping options remarkable versatility

A broad tonal palette urgically precise sound-sculpting functions

powerful remote control options

ultra-advanced, tone-generating machineplaying pleasure value to boot

Two channels

Switchable and adjustable

-> assigned to; button assigned to .

-> . You can footswitch these knobs to activatetwo different power amp volume settings on the fly without twisting a knob.

It lets you select the two channels incombination with , thereby affording you direct access to four gainstages, and the means to control two additional (sound-shaping) features ofyour choice. Three ¼" (6.3 mm) stereo jack plugs accept three dual footswitchesthat let you remotely control the two channels; , , ,

(off/on), and the (off/on).-> Activate it at the amp or via

footswitch to suppress excessive noise at very high gain settings.

Among the hallmarks of this fine amp are painstaking workmanship and finishing aswell as rigorously tested and carefully selected quality components. You'll findguidelines on care and maintenance of tube amps on page 17. Under the heading Tipsfrom the designer, you'll come across practical tips on the aforementioned featuresthroughout the manual. All critical information concerning the operation of this amp

Two sound switching options in the preamp section:

Two power amp Master knobs

-> The optional Z-9 Custom Footswitch.

A Noise Gate for the Channel 2 with Gain boosted.

BrightChannel 1 Tone Channel 2

Gain Boost

Gain Boost Tone Master A/BFX Loop Noise Gate

FX Loop FX Loop

4.

Channel 1: Clean to subtle overdriveChannels 1 & Gain Boost: Crunch with a touch of preamp overdriveChannel 2 – From crunch to lead with the gain bumped upChannels 2 & Gain Boost: For lead sounds with lots of sustainand high gain reserves

and , each channel

-> : One three-band EQfor and one three-band EQ for .

Four excellent fundamental sounds boasting the finest qualityin tube-driven tone:

Two voicing sections specially tuned for each channel

Channel 1 Channel 2

Channel 1 Channel 2

5

is preceded by "NOTE", "CAUTION", "Read and heed" or some other eye-catchingcomment. We're calling your attention to these remarks for reasons of safety or othercompelling motives, so please give them due consideration.Everyone at ENGL is confident that theand are sure to delight you:

Though this amplifier is relatively easy to handle and you're probably raring to give it ago, I recommend that you read the owner's manual thoroughly before you power itup. It is equipped with several safety features that require further explanation toprevent malfunctions.

1. ENGL Retro Tube Amp Head type E765 - 100 watts or type E762 - 50 watts;2. mains cord;3. this manual;4. Two interchangeable front panel frames, one in red and the

other in yellow5. a pamphlet entitled

.

At the back of the manual, diagrams of the front and rearpanels. As you're the descriptions of the amp's features, you'll gain a betterunderstanding of the topic of discussion if you unfold and refer to them as we go!

¼" unbalanced input jack. Plug your guitar in here using a shielded cord.

Depending on the type of cord and its shielding, you may occasionally encounterinterference from sources such as radio stations or powerful magnetic fields. Whenthis occurs, try connecting your guitar to the amp using different cords. What's more,to minimize signal degradation due to high-frequency loss, use the shortest cordsfeasible (as a rule, the shorter the cord, the less susceptible it is to high-frequencyattenuation).

The Channel 1 Gain control knob determines the preamp's input sensitivity andamplitude when Channel 1 is active.

Here's how this knob's settings relate to the type of guitar pickup. If you are usingsingle-coils, the preamp will start breaking up at about 6, and at around 4 or 5 withmore powerful humbuckers or an active pickup.If you want a pristine clean sound, back off the Channel 1 Gain knob setting and switchoff Gain Boost (14).

Retro Tube amp's extraordinary versatilityoutstanding features Simply plug in, play and be inspired

by the tone of your new great ENGL Amp!A few words of wisdom from the designer:

A tip from the designer:


Contents:

Instructions for the Prevention of Fire,Electrical Shock and Injury

Front Panel Features

("Rocking Red")("Vintage Vanilla") and mounting material (page 24);

you'll find fold-outreading

1 Input

2 Gain Channel 1

6

If you want just a touch of preamp overdrive, I recommend the following settings forsingle-coil pickups: Set the Gain knob between 7 and 10 and deactivate Gain Boost. Forhumbuckers, set the knob between 5 and 8 to get moderate overdrive.Then when you need a grittier tone perfect for playing rock riffs, all you have to do isactivate the Gain Boost in Channel 1.This particular sound-shaping option (Channel 1 - Gain Boost activated) is comparableto plugging an overdrive pedal into the amp's front end. This not only boosts the gainlevel, it also re-voices the internal filter stages to boost the low mids and conjure amore assertive tone.

Extremely high gain and volume levels can produce powerful feedback.Avoid feedback squeals; they can lead to hearing loss and damage speakers! At highervolumes, back off the Gain and Treble levels in order to prevent unchecked feedback!

This feature boosts the upper end of the high frequency range for Channel 1. Itsintensity decreases as gain settings increase.

For a crisp or glassy tone, activate the Bright boost. It brightens the sound ofhumbucking or muddy pickups. Use it to tweak the amp's tone to taste, activating it toboost top-end frequencies or deactivating it to dampen high end response.

This is the preamp voicing section's passive low-frequency EQ for

This is the preamp voicing section's passive midrange frequency EQ

This is the preamp voicing section's passive high-frequency EQ

The best way to get to know the amp and its fundamental sounds is to start out bysetting all tone knobs to the center position (: 5). These are passive tone controlsselected and tuned specifically for the whole retro concept, so their control ranges arenarrower than those of active EQs.

CAUTION:



7 Volume Channel 1

3 Bright

4 Bass

5 Middle

6 Treble

A Tip and Some Important Info from the Designer:

Channel 1.

for Channel 1.

for Channel 1.

Determines the level of Channel 1. Twist this knob to adjust Channel 1's volume anddial in the desired balance of levels with Channel 2. Because this volume control islocated pre effects loop, it also determines the effects send level for Channel 1.

The inputs of modern effect devices can handle signal levels up to +10 dB, so it's a goodidea to dial up a higher send level for the FX loop. Do this by turning up the Channel 1(7) and Channel 2 (13) preamp Volume knobs. Dial in settings higher than 5 to makethe most of the dynamic range between the preamp and power amp.Once you have matched the preamp and effects device level, use the Master knob (16)to adjust the amp's overall volume. If you insert older stomp-boxes devices into the

7

RetroTube amp's FX loop, you can reduce the level at the FX Loop Send jack (30) tosomewhere between -20 dB and -10 dB by setting the two channel Volume knobsbetween 1 and 4. Older effects pedals usually don't handle high input levels well. Evena -10 dB signal can cause undesirable distortion.

Gain control for the Channel 2. This Control knob determines input sensitivity whenChannel 2 is active. Use it to dial in the desired amount of preamp saturation level.

Preamp Channel 2 is a lot hotter than Channel 1 because its baseline gain level is a lothigher. It is roughly comparable to that of Channel 1 with Gain Boost activated.However, its tonal structure is different, giving you yet another flavor of overdriventone to spice up your musical act.Activating Gain Boost sends Channel 2 into very different sonic territory withsustaining lead tone that is great for soloing.If you push Channel 2 hard while Gain Boost is active, the preamp gain will besubstantial and noise such as hissing and any buzzing produced by guitar pickups willbe amplified considerably. If you wish to configure the preamp so that both Channel 2and Gain Boost are on, you can activate the Noise Gate (see section 29) to largelysuppress such noise.

Extremely high gain and volume levels in Lead mode can produce powerfulfeedback. Avoid feedback squeals; they can lead to hearing loss and damagespeakers! At higher volumes, back off the Gain and Treble levels in order to preventunchecked feedback!

This sound-shaping button mainly influences the upper midrange. When activated, itboosts the frequency range between 500 Hz and 1 KHz.

For more details see the chapter 21 and 23 on page 11 and 12 !

The Tone button voices specific midrange frequencies that are instrumental in fine-tuning a guitar's sound. The amp's sound will be thicker when it is activated.If you want a less dominant midrange, leave this feature deactivated; that is, don'tpush this button. The Tone button also lets you adapt Channel 2's fundamental soundto suit different types of guitar pickups.

8 Gain Channel 2


CAUTION:

9 Tone

A Tip from the Designer:

10 Bass

11 Middle

12 Treble

ToneThe LED above the button lights up to indicate is activated.The Tone sound feature may also be switched using a Z-9 Custom Footswitchconnected to the S.A.C. Port (21) or a footswitch connected to jack (23).

This is the preamp voicing section's passive low-frequency EQ for Channel 2.

This is the preamp voicing section's passive midrange EQ for Channel 2.

This is the preamp voicing section's passive high-frequency EQ for Channel 2.

8


13 Volume Channel 2

To help you get acquainted with the amp's fundamental sounds, I recommend thatyou set all tone controls to the center position; that is, to around 5. For higher-gain,high-volume lead sounds, your best bet is to turn the Treble knob down to prevent thepickups and speakers from generating undesirable feedback. I'd recommend a settingbelow 5.Though this passive voicing section's control range is narrower than that of acomparable active system, its EQ curve is tweaked specifically for its designatedpurpose and will give you satisfying results, so you have heaps of voicing options fortailoring retro sounds to taste.

Master A volume knob. Located post FX Loop, it adjusts the power amp's output level.Master A is enabled and its setting determines the master level if you have notconnected a footswitch to the amp. If you have connected a footswitch you can use itto activate another master level as determined by the Master B (27) knob setting.

Determines the level of Channel 2. Twist this knob to adjust Channel 2's volume anddial in the desired balance of levels with Channel 1. Because this volume control islocated pre effects loop, it also determines the effects send level for Channel 2.

see the chapter 7 on page 7!

Press this button to increases the amplitude in Channel 1 and Channel 2 considerably.The yellow LED above the button lights up to indicate is active. The button(14) on the amp's front panel is disengaged when you switch via footswitch(21, 24). may also be switched via an ENGL Z-9 Custom Footswitchconnected to the S.A.C. Port (21) or via a footswitch connected to jack 24. For moredetails, see chapters 21 and 24 on page 11 and 12 !

Activating Gain Boost in Channel 1 increases the gain level significantly, enough to pushthe preamp into overdrive. This brings out and tightens up the middle frequencies toconjure a more assertive sound for classic-style rhythm workouts. Activating Gain Boostin Channel 2 kicks up the gain level considerably, saturating the preamp to give you farmore sustain and much thicker tone. This means you can coax blazing lead tone out ofthe amp without having to connect an outboard gain enhancer or overdrive pedal. Andthe sound qualitymaywell sendyour stomp-boxes into retirement.

This channel switching button selects Channel 1 or Channel 2. Press it to activateChannel 2. The red LED above the button lights up to indicate is active.Channels may also be switched via the ENGL Z-9 Custom Footswitch connected to theS.A.C. Port (21) or via a footswitch connected to jack 24. For even greater convenience,you could also use the optional ENGL Z-9 Custom Footswitch to select the two channelsin combination with the two Gain Boost stages directly by simply tapping the Z-9's fourchannel-switching buttons. Formoredetails, see chapters 21and 24on page11 and12!

A tip and important info from the designer:

14 Gain Boost


15Channel 1<>2

16MasterA

Gain BoostGain Boost

Gain Boost

Channel 2

9


17 Stand By


18 Power

CAUTION: After an extended period of operation and higher ambient temperaturesthe amps's chassis can become very hot, therefore avoid touching the rear panelsurface !

You could use an ENGL Z-9 foot controller, for example, to remotely control Master A,the default when you are not using a footswitch, and Master B, which is only accessiblevia footswitch. Then you could dial in different levels for Master A and Master B andcombine these with the amp's various modes – very practical for shaping tone andcontrolling volume on the fly at gigs. Note that the four channel switches on the ENGLZ-9 foot controller let you access Channel 1 and Channel 2, and each directly incombination with Gain Boost and Master A/B modes. This gives you a range ofalternatives that you can apply to different playing styles and situations to greatdramatic effect, for instance, to play rhythm and more restrained leads over Channel 1and then kick up the preamp gain for playing high-octane rock riffs and leads overChannel 2.Beyond that, you can also broaden the volume and tonal ranges by working yourguitars' volume knob. If your arsenal includes MIDI gear - for instance, the Z-11 ENGLMIDI Switcher in combination with the Z-9 Custom Footswitch - you can use the MasterA/B switching function to call up different volume levels for the various preampsetups.

Power amp standby switch: Use this switch to silence (0 position) the amp when youtake longer break. The amp's tubes stay nice and toasty, and the amp is ready to rollimmediately when you ramp it back up to full power.

I suggest you get into the habit of using standby during short breaks. In this mode,current is not piped through the power tubes, so they don't get as hot (due to the lackof anode dissipation) and are spared considerable wear. The amp is ready to run whenyou flip the Standby switch because the tubes are already warm and don't require timeto heat up. For breaks of 30 minutes and longer, I recommend that you switch the ampoff in order to conserve energy.

Mains power on/off.ensure that the Stand By switch (17) is set to (0 position) before

you switch the amp on. Let the tubes heat up for about 30 seconds before you activatethe power amp. This procedure spares the tubes.

Stand ByPlease note:

10

Rear Panel FeaturesAt the back of the manual you'll find a folded page offering diagrams of the front andrear panels. Please unfold and refer to it as you read through the descriptions offeatures and functions!

Plug the mains cord in here. For European models, use a standard non-heatingequipment connector cable.

alongside

The rear chamber contains the mains fuse and in the front chamber, a spare fuse.

To learn if a given feature may be controlled remotely, refer to its description herein.You'll find a configuration table showing the Retro Tube Amp's functions on page 23.The ENGL Z-9 Custom Footswitch is optional.

Plugging a jack plug into the S.A.C. Port disables the Gain Boost and theChannel switching functions controlled by the buttons (14, 15) arrayed on the amp'sfront panel. What's more, it also disables the footswitch jacks' (24) remote-controlcapability. In other words, when a Z-9 board is plugged in, it has priority over the amp'sGain Boost and Channel switching controls as well as Gain Boost and Channelswitching via a footswitch connected to jack (24).

Never link two S.A.C. Ports of Engl amps via an Y-adaptor to a Z-9 CustomFootswitch; this can cause ground hummming noise and damage the internal circuits!

Try out the ENGL Z-9 Custom Footswitch - chances are you'll love the remote-controlconvenience for your RetroTube amp. Based on a rather clever switching concept, it

Mains Connector (

CAUTION: Make sure you use an intact mains line cord with a grounded plug!Before you power the amp up, ensure the voltage value printed the mainssocket is the same as the current of the local power supply or wall outlet.Please also heed the guidelines set forth in the separately included pamphlet,

.

20 Mains Fuse Box:

CAUTION: ALWAYS make sure replacement fuses are of the same type and have thesame ratings as the original fuse! Please refer to the fuse ratings table.

21 Footswitch: Serial Amp Control Port (S.A.C.)

Heads up:

CAUTION: Connect only the ENGL Z-9to this 6.3 mm (¼") stereo jack! Connecting any other

switching device may damage it and/or the amp's circuitry!Insert and remove the Z-9's cable to and from the S.A.C. Port only when the amp isswitched off!Please note:


Instructions for the Prevention of Fire, Electrical Shock and Injury

19 AC Power Inlet; IEC - C14 connector)

This serial data input serves to control six of the amp's switching functions remotely. Itaccepts the optional ENGL Z-9 Custom Footswitch as well as the optional ENGL Z11-S.A.C. MIDI Switcher for use as a MIDI interface. Use a cord equipped with stereo 6.3mm (¼") jack plugs to connect this input to the S.A.C. Out on the Z-9 Footswitch or Z11-S.A.C. MIDI Switcher. The custom-designed Z-9 and the MIDI Switcher (in MIDIinterface mode) let you switch every amp feature designated as footswitchable in thismanual. You can configure the Z-9 Footswitch to control

and and two further features directly.Master A/B

or the ENGL Z11-S.A.C. MIDISwitcher (S.A.C. Out)

the two channels incombination with Gain Boost

Footswitch

11

features four switches that afford you direct access to Channel 1 and Channel 2 incombination with the two Gain Boost stages.Alongside selecting channels, you can opt to control any other two switchable ampfunctions such as and or and , and so forth.

to connect a conventional footswitch with twoswitching functions, for example, the ENGL Z-4 (2 x off/on - Single Pole Single Throw orSPST for short). This type of footswitch lets you access

One of the two switches enables or bypasses , while the other switchesthe Noise Gate on and off (Channel 2 with Gain Boost engaged only).Note also: A footswitch may be equipped with LEDs indicating the given switchingstatus. Each of the two switches is provided with approx. 10 milliamperes current,which suffices to power a standard LED. The jack's mono terminal controls

, while the stereo terminal controls on (for pin assignments, seepage 22).

Plugging a footswitch into this jackdisables onboard (9) switching.Note also: A footswitch may be equipped with LEDs indicating the given switchingstatus. Each of the two switches is provided with approx. 10 milliamperes current,which suffices to power a standard LED. The jack's mono terminal selects ,while the stereo terminal controls the Tone feature (for pin assignments, see page 22).

to connect a conventional footswitch with twoswitching functions, for example, the ENGL Z-4 (2 x off/on - Single Pole Single Throw or

Tone Master A/B FX Loop Noise Gate

Noise Gate

Tone

22 Footswitch: FX Loop, Noise Gate Off - On

23 Footswitch: Master A/B, Tone

24 Footswitch: Channel 1 < > 2, Gain Boost

Another tremendous benefit of this microcontroller-driven footboard is that itconnects to the amp via an easily obtained, standard stereo cord. But that's not the lastof the Z-9's advantages: At some point, you may decide to ramp up or connect to aMIDI system using the ENGL Z11-S.A.C. MIDI Switcher. This won't render the Z-9obsolete because it also serves as a simple MIDI footboard with a MIDI OUT (5-pin DINconnector) that selects 10 MIDI patches (or presets, if you prefer). Again, I want toemphasize that you should never connect another footboard to this jack: The Z-9 andthe Z11-S.A.C. control the amp via a proprietary ENGL serial data protocol, and theSerial Amp Control Port was developed exclusively for ENGL amps. No other footboardwill work and in fact is likely to damage the footboard or the amp's circuitry!You can use the ENGL Z11-S.A.C. MIDI Switcher to integrate the amp straight into aMIDI system. You can also opt to control two amps in parallel using the Z11-S.A.C.MIDI Switcher and MIDI commands. The Z11-S.A.C. Switcher is equipped with sixswitching loops (accessed via three stereo jacks) and the S.A.C. Out (stereo jack) forprecisely this purpose!

Use this ¼" (6.3 mm) stereo jack

on/off andon/off.

on/off /off

Use this ¼" (6.3 mm) stereo jack to connect a conventional footswitch with twoswitching functions, for example, the ENGL Z-4 (2 x off/on - Single Pole Single Throw orSPST for short). This type of footswitch lets you access and . One ofthe two switches activates Master A or B, while the other selects the Tone control,which boosts Channel 2's midrange frequencies.

Use this ¼" (6.3 mm) stereo jack

FX Loop Noise GateFX Loop

FX Loop

Master A/B Tone

Master A/B

12

SPST for short). This type of footswitch lets you access the two channels and Gain Boostoff/on. One of the two switches activates or ; the other engages

. Plugging a footswitch into this jack disables onboard channel (15)switching and (14).Note also: A footswitch may be equipped with LEDs indicating the given switchingstatus. Each of the two switches is provided with approx. 10 milliamperes current,which suffices to power a standard LED. The jack's mono terminal selects Channel 1 orChannel 2, while the stereo terminal controls the Gain Boost feature (for pinassignments, see page 22).

A fuse in the rear chamber of this fuse drawer protects the V8 (Retro Tube 50: V6)power tube. It is designed to blow in the event of an electrical problem with tube V8(Retro Tube 50: V6). The Power Tube Fuse LED (28) lights up to indicate that one orseveral of the four fuses has blown. There is a replacement fuse in the front chamber ofthe fuse drawer.

Always make sure replacement fuses are of the same type andhave the same ratings as the original fuse! See section 28 for some more key factsabout tube defects.

A fuse in the rear chamber of this fuse drawer protects the V7 (Retro Tube 100) powertube. It is designed to blow in the event of an electrical problem with tube V7 (RetroTube 100). The Power Tube Fuse LED (28) lights up to indicate that one or several ofthe four fuses has blown. There is a replacement fuse in the front chamber of the fusedrawer.


Master B volume knob. Located post FX Loop, it gives you an alternative to the MasterA knob (16). In another words, you can set a different power amp output level andthen activate this Master B volume via footswitch. If you wish to switch betweenMaster A and Master B, you have to connect an ENGL Z-9 Custom Foot Controller tothe S.A.C. Port (21) or footswitch such as the ENGL to jack no. 23. Two options forcontrolling Master A/B via the Z-9 are described on page 10. You'll find tips on how tomake the most of Master A/B switching in section 16 on page 9 & 10.

This LED lights up to indicate one of the fuses in the fuse drawer (see the descriptionsunder 25, 26, 33, 34) has blown to protect the power tubes.

Channel 1 Channel 2Gain Boost

Gain Boost

25 Power Tube V8 Fuse (Retro Tube 50 Amp - E762: Power Tube V6 Fuse )

CAUTION: Switching off the amp and pull the mains plug before opening the fusedrawer!Need-to-know info:

26 Power Tube V7 Fuse (Retro Tube 100 Amp - E765)


28 Power Tube Fuse LED

27 Master B

13

Need-to-know info:

29 Noise Gate Threshold Level


IMPORTANT note; please read and heed

As a rule, it is an electrical problem with the tube that causes apower tube fuse to blow. Normally this power tube is defective and needs to beswapped for a new tube. The best way to tell if the defect is permanent is to replacethe fuse before installing a new power tube.The tube map on page xx shows the positions of the power tubes. The RetroTube 100is equipped with four fuses for the V5, V6, V7 and V8 power tubes; the RetroTube 50requires just two fuses for the two V5 and V6 power tubes. With a replacement fuse inevery fuse drawer, there are plenty of backups on board.

This control activates an onboard Noise Gate serving to suppress any excess noisegenerated when both Channel 2 and Gain Boost are active. To this end, twist the knobclockwise, near or just beyond the 9 or 10 o'clock position.In addition the Noise Gate can be controlled remotely (on/off) via a footswitchconnected to jack 22 (for details refer to chapter 22) or via the ENGL CustomFootswitch Z-9 (refer to chapter 21 for details). If you want to control the Noise Gateremotely via footswitch, you must set the Threshold knob to 10 o'clock or beyond.Use this knob to set a threshold value (that is, the noise level) at which the Noise Gateactivates to suppress the signal within the 9 to 5 o'clock range. The further you twistthe knob to the right, the higher the signal level at which the Noise Gate kicks in. If youset the knob to the 5 o'clock position, the Noise Gate reacts to extremely high noiselevels, meaning that there's not much of a margin between the guitar signal andbackground noise.

Noise is a definite no-no in many situations. For example, studio etiquette demandsthat you keep a lid on extraneous noise during short breaks. It's in the nature of high-gain rigs to generate undesirable peripheral noise in overdriven (high gain) channels.This is attributable to the physical properties of an amp's constituent components, inparticular its active components. That's right; those cherished tubes are the culprits.The Noise Gate is a tool that lets you silence this noise during breaks by way of signalmute circuit. Note that electric guitars pick up interference signals, and these areamplified tremendously at high gain levels (Channel 2 with Gain boosted). The mostcommon source of noise is 50 Hz or 60 Hz (hertz/cycle) mains hum, particularly whenthe guitar is positioned near transformers and power units. Because in worst-casescenarios this humming can attain extremely high levels, the Noise Gate can hardlydistinguish between the musical signal and noise. This makes it hard to find the rightThreshold setting. It is entirely possible for this humming and other noise to rise to alevel that deactivates the Noise Gate and therefore becomes audible. My advice is tostay as far away from transformers and power units as space allows.

: The may open up inadvertentlywhen the is activated, a high-gain Lead channel is selected, and the volumeexceeds the Threshold knob setting. At very high volume and gain settings, this maygenerate instant feedback, particularly if your guitar is facing the speakers. Ratherthan musical and controlled, this is the shrill, unpleasant and potentially harmfulvariety of feedback squealing that sends your audience and fellow musicians packing.Though the amp is not more susceptible to feedback when the is activated,

Noise GateNoise Gate

Noise Gate

14

the fact that it suppresses extraneous noise means you can't hear those telltale signsthat feedback is swelling and consequently can't take measures to suppress it. For thisreason, make an extra effort to be careful when the is activated: Beforeyou approach the amp and speaker cabinet with your guitar in hand, turn the guitar'svolume knob to the far left position (to 0 so that no signal is audible) to prevent thepickups and speakers from interacting!

Connect to a signal processor's input/return jack using the shortestpossible shielded cord equipped with 1/4" plugs. The FX Loop can be controlledremotely (: on/off) via a footswitch connected to jack 22 (for details refer to chapter22) or via the ENGL Custom Footswitch Z-9 (refer to chapter 21 for details). In thesignal path, the located post preamp and pre the two power amp Masterknobs.NOTE: The FX Loop Send output is removed from the preamp signal path when the FXLoop is deactivated.

Connect the input to a signal processor's output/send jack using the shortestpossible shielded cord equipped with 1/4" plugs. The FX Loop can be controlledremotely (: on/off) via a footswitch connected to jack 22 (for details refer to chapter22) or via the ENGL Custom Footswitch Z-9 (refer to chapter 21 for details). In thesignal path, located post preamp and pre the two power amp Masterknobs.

FX mix control for the . When the knob is set to , the amp signal is routedthrough with no processed signal (0% wet balance) added to the mix. Twist the knobclockwise to blend in the processed signal (parallel/passive, wet balance 1-99%,depending on knob position). When the knob arrives at the Effect position, only thewet signal (that is, the processed signal generated by the connected effect device) ispatched to the power amp (serial, 100% wet).

Set this knob to when this loop is not in use! S

A fuse in the rear chamber of this fuse drawer protects the V5 power tube. It isdesigned to blow in the event of an electrical problem with tube V5. The Power TubeFuse LED (28) lights up to indicate that one or several of the four fuses has blown.There is a replacement fuse in the front chamber of the fuse drawer.


Noise Gate

FX Loop Dry

Dry

30 FX Loop Send

31 FX Loop Return

32 FX Loop Balance

NOTE:

33 Power Tube V5 Fuse


the FX Loop output

FX Loop is

FX Loop

FX Loop is

NOTE: The effect signal at the FX Loop Return input is removed from the signal pathwhen the FX Loop is deactivated.

ettings between the 9 and 3o'clock position reduce the signal level.

15

34 Power Tube V6 Fuse (Retro Tube 100 Amp - E765)


35, 36 Poweramp Output, 4 Ohms Parallel

37, 38 Poweramp Output, 8 Ohms Parallel

39 Poweramp Output, 16 Ohms

IMPORTANT NOTE, please read and heed:

Cabinet options

A fuse in the rear chamber of this fuse drawer protects the V6 (Retro Tube 100) powertube. It is designed to blow in the event of an electrical problem with tube V6 (RetroTube 100). The Power Tube Fuse LED (28) lights up to indicate that one or several ofthe four fuses has blown. There is a replacement fuse in the front chamber of the fusedrawer.


4 ohms speaker output jacks, internal connected parallel. For diverse cabinet options!

8 ohms speaker output jacks, internal connected parallel. For diverse cabinet options!

16 ohms speaker output jack. For diverse cabinet options!

Never operate the power amp without asufficient load, otherwise you may damage or destroy it! Always check the connectedcabinets' impedance to confirm it matches the amp's output impedance! For example,if you are connecting a cabinet to one of the two 8-ohms output, make sure thespeaker system is indeed rated for 8 ohms. You'll find the various speaker and cabinetoptions listed in the nest section. I cannot stress enough the importance of properimpedance matching when connecting one or more cabinets to your amp. Impedancemismatching can damage the power amp!

1. One 4-ohm cabinet connected to a 4-ohm jack;Summary: 4 Z, -> connected to 4-ohm output.

2. Two 8-ohm cabinets connected to the 4-ohm jacks;Summary: 8 Z + 8 Z, -> connected to 4-ohm + 4-ohm output.

3. One 8-ohm cabinet connected to an 8-ohm jack;Summary: 8 Z, -> connected to 8-ohm output.

4. Two 16-ohm cabinets connected to the 8-ohm jacks;Summary: 16 Z + 16 Z -> connected to 8-ohm + 8-ohm output.

5. One 16-ohm cabinet connected to the 16-ohm jack;Summary: 16 Z -> connected to 16-ohm output.

6. An 8-ohm cabinet connected to one of the 4-ohm jacks in combinationwith a 16-ohm cabinet connected to one of the 8-ohm jacksSummary: 8 Z + 16 Z -> connected to 4-ohm + 8-ohm output.

abinet options

abinet options

abinetoptions

see the chapter

see the chapter

see the chapter

C

C

C

16

Handling and Care:

* Keep the amp safe from hard knocks and shocks. Tubes are fragile and tendto suffer when exposed to mechanical stress!

* Let the amp cool down before you transport it. Ten minutes or so will sparethe tubes.

* Tubes take some 20 seconds to warm up after you switch the power on, andabout two to three minutes before they are able to pump out full power. Makea habit of giving your amp plenty of time to get toasty and flipping the Standbyswitch for short breaks.

* In order to spare the power tubes and prolong their lifetime, we recommendto set the Stand By switch to (0 position, that is) before you switchthe amp on. After a period of 30 seconds you may activate the poweramp byflipping the Stand By switch.

* Avoid storing the amp in damp or dusty rooms to spare jacks, switches andpotentiometers. If you don't use the amp all the time, I recommend that youdrape a covering over it to prevent the intrusion of dust. Even better, keep itin a transport cover or flight case.

* Never use caustic or scouring detergents to clean the amp's housing, front orrear panels. Use a soft, damp cloth or sponge with diluted soapsuds or astandard brand of mild dishwashing liquid instead. Never use solvents they cancorrode the amp's vinyl skin and dissolve the front and rear panel labels. Keepliquids well away from the amp, particularly the interior of the housing.

* Make sure air can circulate at the rear and top of the amp to allow foradequate cooling, which increases component life.

* Never operate the amp without an adequate load (a speaker, cabinet orsuitable terminating resistor).

* High ambient temperatures place an additional strain on diverse components; soif at all possible, avoid operating the amp at temperatures far higher than 30°Cfor longer periods. Running the amp at mains voltages exceeding the nominalmains input voltage over longer periods can also shorten component life.

* Replace tubes with selected tubes that satisfy ENGL selection criteria to forestallmicrophonic properties, undesirable noise and unbalanced power amp signals.Because power tubes' idle current (bias) must checked and possibly adjustedwhen replacing tubes, this is a job best left to experienced and authorizedspecialists.

Stand By

17

Troubleshooting

* Some features that may be controlled remotely using a Z-9 or Z-4 footswitchfail to respond when you change settings:

* The amp fails to respond when you try to control switching functions remotelyvia the Z-9 footboard.

* The amp fails to respond when you try to control switching functions remotelyusing a footboard such as the Z-4 or a MIDI switcher such as the ENGL Z-11.

* The amp is not providing an output signal / no sound is emanatingfrom the speaker.

-> Powerful static charges, strong radio signals, or mains voltage spikes can affectmicrocontroller-driven systems, setting them to an undefined status commonlycalled a hung chip. In this event, your only choice is to reset the system. Simplyswitch the amp off and on again.

-> If a reset doesn't solve the problem, there is a defect in the control system,probably on the logic board holding the microcontroller or merely a faultycontact on one of the four stereo footswitch jacks (21, 22, 23, 24). In this case,consult an authorized service center or a professional specialist.

-> Is the Z-9 footboard connected to the S.A.C. Port (21)?-> Is the cord you are using stereo, intact, and wired properly?

(Refer to page 22 for pin assignments.)

-> Are the footboards or switching loops connected to the correspondingfootswitch jacks (22, 23, 24)?

-> Are the cords you are using stereo, intact, and wired properly?(Refer to page 22 for pin assignments.)

-> If you are using footswitches other than an ENGL Z-4 or Z-11, are the switchesor relays inside the boards or switching loop systems off / on Single Pole SingleThrow (SPST) switches? In other words, do these switches continuously connectto GND when you wish to activate the given function? If you're unsure aboutthe answers to these questions, consult an authorized service center or aprofessional specialist.

-> Is at least one speaker connected to the speaker outputs 4 ohms, 8 ohmsor 16 ohms (35, 36, 37, 38, 39) ?

-> Is the power amp activated (Standby switch to ON) ?-> Are all cords (guitar, effect, and speaker) connected properly

and are they functional ?-> Unplug connected effectors and see if the preamp works fine without

these peripheral devices.-> Is the Noise Gate activated in one of the Lead channels and the Threshold (29)

knob set to a high value? Deactivate the Noise Gate (29) for a quick check.-> Are the active Master knob and the Gain and Volume knobs set to a value

greater than 0 ? If any of these knobs is set to 0, no signal is routed tothe amp's outputs.

18

-> You may be looking at a faulty tube or another defect. In this case,be sure to take the preamp to an authorized, professional service center.

-> Is there a connection (for example, via a shielded circuit) between theamp and another device that is grounded via a power plug of its own?Two or more circuits sharing a common electrical ground line can causeaudible hum. If low-frequency noise is emanating from your rig,be sure to consult a specialist.

-> The amp and mains grounds are not connected properly or are altogetherdisconnected. Have an experienced specialist check this.

-> Cords connected to the input or effect loops may not be shielded properly.Replace them to check if this is indeed the case.

-> The amp or speaker cords may be picking up interference from powerfulmagnetic fields (for example, of nearby power transformers or electrical motors).Reposition the amp and connector cables.

-> The amp or speaker cords may be picking up radio signals, for example,from activated mobile telephones or powerful local transmitting stations nearby.Switch off mobile phones while troubleshooting noise problems.

-> The given power tube is probably defective. If that power tube's fuse is replacedand the new fuse also blows, the tube needs to be swapped out.

-> The amp has been overloaded, perhaps by excessive volume levels, excess mainsvoltage, or the wrong output impedance (where the impedance setting does notmatch the connected speaker's impedance).Check the speakers' overall impedance and, if necessary, adjust your setupaccordingly (see the list on page 16). Refer to section 28 for some more key factsabout tube defects.

* The speaker is emitting humming noises:

* One of the power tube fuses blows:

19

Technical Data

Output power:

Input sensitivity levelsInput:

Output levels

Power consumption:

Fuses:

Important:

Tubes

Logic control system

System interface:

Dimensions:

Weight:

Effect Return:

Effect Send:

at 220/230/240 mains voltage

at 100/115/120 mains voltage

Power Tube Fuses:

V1:V2, V3:V4:V5, V6, V7, V8:Consult Tube Mapto view tube array

Processor, software:

(S.A.C.)Serial Amp Control

20

E765: 100 watts;E762: 50 watts

range: --40 dB to -10 dB (Channel 1),

range: -20

E765: approx. 410 Watt (490 VA) max.E762: approx. 220 Watt (260 VA) max.

E765: 2 AT LE762: 1,25 AT LE765: 4 AT LE762: 2,5 AT LE765: 4 x 160 mAME762: 2 x 160 mAM

ECC83 selected;ECC83 standard;

71 x 27 x 27 cmapprox. 27.9" x 10.6" x 10.6" (l x h x d);

approx. 22,5 kg (E765)approx. 49,4 lbsapprox. 21 kg (E762)approx. 46,3 lbs

-20

approx. (l x h x d);

approx.approx.

adjusted accordingly to 4, 8 and 16 ohms;

(T: slo-blo);

(M: medium-blo);

ECC83 F.Q., input tube;

EL34, matched sets; (V7 & V8 only in E765 Amp)Replace tubes with selected sets only!

;

AT89C2051 µC with internal 2K Flash Memoryfor software source code; Upgradeable withexternal Programmer;

Proprietary ENGL asynchronous data protocol

Replace these with fuses of the same typeand rating only!

max. 0 dBrange: dB to 0 dB, max. 5 dB

.

dB to 0 dB, max. 5 dB

Tube Map:

Tube replacement report:

1. Replaced on: _ _ _ _ _ _ _ 20 _ _ _ Replaced by: _ _ _ _ _ _ _ _ _ _ _ _ _ _

Replaced tubes: _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

Reason: _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _


Replaced tubes: _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

Reason: _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _


Replaced tubes: _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

Reason: _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

the tubes and their function:V1 - ECC83 (12AX7): input stage, 2. gain stage; grade: FQ selectedV2 - ECC83 (12AX7): Channel 2 driver stage, 4. stage; grade: selectedV3 - ECC83 (12AX7): FX buffer stage, poweramp driver stage; grade: selectedV4 - ECC83(12AX7): phase splitter; grade: standardE762: V5, V6: EL34: power tubes, poweramp, matches setE765: V5 to V8: EL34: power tubes, poweramp, matches sets

21

V1 V2 V3 V4

MainsTransformer

OutputTransformer

amp chassisas viewed

from above;Front panel Input Input

V5 V6 V7 V8E765:

V5 V6E762:

ON/OFFON/OFF

R

Amp

Tube

FOOTPEDALZ-4

Your Options for controlling the ENGL Retro Tube amp remotely:

#1 ENGL Z-9 Custom Footswitch: This specialized footboard connects to the amp via a 6.3 mm (¼ ”) stereo cord plugged into the Serial Amp Port - S.A.C. (21). The Z-9 affords you direct access to the amp's two Channels in combination with Gain Boost simply by tapping the four channel switching buttons, and lets you control two special functions, for example, Tone and FX Loop.As an alternative to the Z-9 footswitch, you can also connect the ENGL Z11-S.A.C. MIDI Switcher (S.A.C. Out) to the amp's S.A.C. Port for use as a MIDI interface.

#2 A two-way footswitch such as the ENGL Z-4: Connect dual footswitches to the amp by plugging stereo 6.3 mm (¼ ”) cords into jack nos. 24, 23, and 22. -> Channel 1< >2 and Gain Boost (1 x Z-4);-> Master A/B and Tone (1 x Z-4);-> FX Loop and Noise Gate (1 x Z-4);As an alternative to dual footswitches, you can connect a MIDI switcher (the ENGL Z-11 will do nicely) to thesethree jacks to control the six switching functions.

#2

#1

R

AmpTechnology

Tube

CustomFootswitch

Z-9

Ser.Cnt.:Channel 1

Ser.Cnt.:Channel 2

Ser.Cnt.:Channel 3

Ser.Cnt.:Channel 4

Ser.Cnt.:Function 1

Ser.Cnt.:Function 2

MIDI:Patch 1/6

MIDI:Patch 2/7

MIDI:Patch 3/8

MIDI:Patch 4/9

MIDI:Patch 5/10

MIDI:Bank A/B

Power Supply In7-14 Volts AC9-20 Volts DC

approx. 100 mA

MIDIOut

Serial AmpControl Out

Caution !Connect To

AmplifierOnly!

Design byHorst Langer

To assign Amp switchingfeatures to the Function1 and 2 button, press the

Channel 1 and therespective Function button

simultaneously until theLED starts flashing.Now use the buttons

1 to 4 to selectthe desired switching

feature (press 1x or 2x).Store the selected

switching feature by pressing the opposite

Function buttonfor approx. 1 second.

Wiring of Principal Connectors

Stereo1/4" jack

Serial Amp Control Port (21)

tip: + 5 volts

ring: Data

sleeve: Ground, GND

Very important:use a stereoplug only!Connect ENGL Custom Z-9 Footswitch only!

Stereo1/4" jack

Dual Footswitch (22, 23, 24)

tip: refer to *T

ring: refer to *R

sleeve: Ground, GND

Use a stereoplug only!

page: 12

Stereo1/4" plug

ringtip

sleeve

Here you'll find at a glance the technical details of the Retro Tube Amp's various remote switching capabilities:A switch connected to this terminal *R controls Noise Gate; off <-> on via jack 22; Tone; passive <-> active via jack 23; Gain Boost; passive <-> active via jack via jack 24.A switch connected to this terminal *T controls FX Loop; off (bypassed) <-> on (enabled) via jack 22; Master A/B; Master A <-> Master B via jack 23; Channel 1< >2; Channel 1 <-> 2 via jack 24.

page: 11

22

#1 #2 #2 #2

Footswitch connectors(4 x stereo jack sockets)located at the rear panel of the amp.

(21) (22) (23) (24)

SERIAL AMP

CONTROL PORT

CAUTION:

CONNECT CUSTOM

FOOTSWITCH Z-9 ONLY!

CHANNEL

1 2

GAIN BOOST

FOOTSWITCH

MASTER

A/B

TONE

FX LOOP

NOISE GATE

OFF-ON

S.A.C. PORT

#1S.A.C. Out

The ENGL Z11-S.A.C. MIDI Switcher's rear panel

ENGL Z-9 Custom Footswitch

ENGL Z-4 dual footswitch

MIDI THRU MIDI INLOOP 1 & 2COM. L2 L1

SERIAL AMP

CONTROL OUT

(S.A.C.)

MIDI SWITCHER / TYPE: Z11-S.A.C.POWERSUPPLY

ENGL MIDI

FOOTCONTROLLERZ9, Z12, Z15

x

LOOP 3 & 4COM. L4 L3

12 Volts AC12 Volts DC

300 mALOOP 5 & 6COM. L6 L5

Configuration table for assigning the Retro Tube Amp's sound-shapingand special functions to the Z-9 Custom Footswitch's and :Functions 1 2

Button amps's Functions Setup Indication S.A.C.1: LED 1 lights

no 1: LED 2 lights1: LED 3 lights1: LED 4 lights

no 1: LED 1 flashes1: LED 2 flashes

no 1: LED 3 flashesno 1: LED 4 flashesno 2: LED 1 lightsno 2: LED 2 lightsno 2: 3 LED 3 lights

2: LED 4 lightsno 2: LED 1 flashes

2: LED 2 flashes2: LED 3 flashes

no 2: LED 4 flashes

Column 1 lists the Function button on the Z-9. Column 2 lists the sound-shapingand special functions that can be assigned to it.

Column 2 lists sound-shaping and special functions on the ENGL Retro Tube Ampthat can be controlled remotely via the Z-9 Custom Footswitch.

Column 3 lists the configuration or setting required to remote-controlsound-shaping or special functions on the Retro Tube Amp.The first digit indicates the routine, that is,1: for Setup and 2: for .

to denotes the button used to enter the setting.Column 4 indicates the currently or newly selected configuration. For example, if

LED 3 flashes when the Z-9's Setup routine is activated,then the Retro Tube Amp's switching feature is currently assigned to

; the corresponding S.A.C. command is .Column 5 lists the shorthand designations for specific configurations that appear

throughout the Z-9 Operator's Manual. For detailed information,please refer to the Z-9 Custom Footswitch Operator's Manual.

The ENGL Z-9 Custom Footswitch is an optional accessory. Theafore mentioned Function buttons, LEDs and setup routines pertain to the Z-9.

Function 1 Master A/B Channel 1 F1-1Function 1 Channel 2 F1-2Function 1 FX Loop off / on Channel 3 F1-3Function 1 Noise Gate off / on Channel 4 F1-4Function 1 Channel 1 F1-5Function 1 Tone Channel 2 F1-6Function 1 Channel 3 F1-7Function 1 Channel 4 F1-8Function 2 Channel 1 F2-1Function 2 Channel 2 F2-2Function 2 Channel F2-3Function 2 Noise Gate off / on Channel 4 F2-4Function 2 Channel 1 F2-5Function 2 Tone Channel 2 F2-6Function 2 FX Loop off / on Channel 3 F2-7Function 2 Channel 4 F2-8

Function SetupFunction 1 Function 2 Setup

Channel 1 Channel 4

Function 2FX Loop

Function 2 F2-7

Comments:

Please note:

23

24

Mounting Instructions: front panel frameCAUTION: Switch the amp off and pull the mains plug before you removethe front panel frame!

Remove the front panel frame:

pull the front panel frame (without the grille!) untilthe locking mechanism unlatches;

raise it slightly then remove it from front of the Amp.

A: Phillips screws8 pcs included, 2 pcs required per clasp;

B: clasp for locking mechanism (latch)4 pcs included, 2 pcs required for each front panel frame

C: required tool:Phillips screwdriver (not included);

Mounting Instructions: front panel frame

Fix the clasps on the front panel frame:

boreholes for the clasps; place the first clasp;

attach this clasp with two screws; tighten the screws carefully;

assemble the second clasp in the same way on the opposite side of the hole.

25

Mounting Instructions: front panel frame

CAUTION: Switch off the amp and pull the mains plug before you fit the frontpanel frame!

Install the front panel frame:

insert the bottom part of the front panel frame in the two milling grooveslocated at the base panel of the amp's housing;

Fit the front panel frame into the front side deepening of the amp's housing;

Push the front panel frame until the locking mechanism latches.

26

Space for User Notes:

27

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ep

art

ure

fro

m t

he in

form

ati

on

giv

en

in

th

e R

etr

o T

ub

e S

eri

es

op

era

tin

g m

an

ual.)

1. EN

GL R

etr

o T

ub

e A

mp

Co

mb

o t

yp

e E

768 - 5

0 w

att

s;2. m

ain

s co

rd;

3. th

is m

an

ual an

d t

his

bro

chu

re f

or

the C

om

bo

Am

p;

4. a p

am

ph

let

en

titl

ed

In

stru

ctio

ns

for

the P

reven

tio

n o

f Fir

e, Ele

ctri

cal Sh

ock

an

d I

nju

ry.

No

ise G

ate

an

d R

everb

:(T

his

is

a d

ep

art

ure

fro

m t

he in

form

ati

on

giv

en

in

th

e R

etr

o T

ub

e S

eri

es

op

era

tin

g m

an

ual.)

A f

oo

tsw

itch

co

nn

ect

ed

to

po

rt 2

2X

or

the E

NG

L Z

-9 C

ust

om

Fo

ots

wit

ch c

on

nect

ed

to

po

rt 2

1 c

an

be

use

d t

o s

wit

ch o

n a

nd

off

th

e R

etr

o T

ub

e C

om

bo

's r

everb

syst

em

rath

er

than

th

e N

ois

e G

ate

.Y

ou

will

fin

d a

desc

rip

tio

n o

f th

e t

wo

reverb

co

ntr

ols

an

d d

eta

ils o

n h

an

dlin

g t

he r

everb

syst

em

in

th

is

sup

ple

men

t.

Fro

nt

Pan

el Featu

res

(Th

is is

a d

ep

art

ure

fro

m t

he in

form

ati

on

giv

en

in

th

e R

etr

o T

ub

e S

eri

es

op

era

tin

g m

an

ual.)

Rev-C

H1: R

everb

(C

han

nel 1)

Reverb

in

ten

sity

kn

ob

. Tw

ist

it t

o a

dju

st t

he a

mo

un

t o

f re

verb

fo

r C

han

nel 1. Tu

rn t

he R

everb

co

ntr

ol

kn

ob

clo

ckw

ise t

o in

crease

th

e e

ffect

's in

ten

sity

. Th

e s

ign

al re

main

s co

mp

lete

ly d

ry w

hen

th

e k

no

b is

set

to t

he p

osi

tio

n "

0"

or

if R

everb

is

deact

ivate

d

via

a f

oo

tsw

itch

. Y

ou

can

sw

itch

th

e r

everb

un

it o

n a

nd

off

usi

ng

a Z

-9 C

ust

om

Fo

ots

wit

ch c

on

nect

ed

to

th

e S

.A.C

. Po

rt

(21)

or

a f

oo

tsw

itch

co

nn

ect

ed

to

jack

(22X

). T

he r

everb

un

it is

alw

ays

on

if

yo

u d

o n

ot

plu

g a

fo

ots

wit

ch in

to t

he p

ort

(21)

or

jack

(22X

).

Rev-C

H2: R

everb

(C

han

nel 2)

Reverb

in

ten

sity

kn

ob

. Tw

ist

it t

o a

dju

st t

he a

mo

un

t o

f re

verb

fo

r C

han

nel 2. Tu

rn t

he R

everb

co

ntr

ol

kn

ob

clo

ckw

ise t

o in

crease

th

e e

ffect

's in

ten

sity

. Th

e s

ign

al re

main

s co

mp

lete

ly d

ry w

hen

th

e k

no

b is

set

to t

he p

osi

tio

n "

0"

or

if R

everb

is

deact

ivate

d

via

a f

oo

tsw

itch

. Y

ou

can

sw

itch

th

e r

everb

un

it o

n a

nd

off

usi

ng

a Z

-9 C

ust

om

Fo

ots

wit

ch c

on

nect

ed

to

th

e S

.A.C

. Po

rt

(21)

or

a f

oo

tsw

itch

co

nn

ect

ed

to

jack

(22X

). T

he r

everb

un

it is

alw

ays

on

if

yo

u d

o n

ot

plu

g a

fo

ots

wit

ch in

to t

he p

ort

(21)

or

jack

(22X

).

16X

Mast

er

AM

ast

er

A v

olu

me k

no

b. Lo

cate

d p

ost

eff

ect

lo

op

, it

co

ntr

ols

po

wer

am

p o

utp

ut.

Th

e r

ed

LED

to

th

e r

igh

t o

f th

e k

no

b lig

hts

up

to

in

dic

ate

Mast

er

A is

en

ab

led

an

d d

ete

rmin

ing

th

e

mast

er

level.

Yo

u c

an

sw

itch

betw

een

Mast

er

A a

nd

Mast

er

B u

sin

g a

Z-9

Cu

sto

m F

oo

tsw

itch

(S.A

.C. F1-1

, p

ag

e

23-O

M)

con

nect

ed

to

th

e S

.A.C

. Po

rt (

21)

or

a f

oo

tsw

itch

co

nn

ect

ed

to

jack

(23).

Fo

r m

ore

deta

ils a

nd

pra

ctic

al h

ints

refe

r to

pag

e 1

0-O

M!

27X

Mast

er

BM

ast

er

B v

olu

me k

no

b. Lo

cate

d p

ost

eff

ect

lo

op

, it

co

ntr

ols

po

wer

am

p o

utp

ut.

Th

e g

reen

LED

to

th

e r

igh

t o

f th

e k

no

b lig

hts

up

to

in

dic

ate

Mast

er

B is

en

ab

led

an

d d

ete

rmin

ing

th

e

mast

er

level.

Yo

u c

an

sw

itch

betw

een

Mast

er

A a

nd

Mast

er

B u

sin

g a

Z-9

Cu

sto

m F

oo

tsw

itch

(S.A

.C. F1-1

, p

ag

e

23-O

M)

con

nect

ed

to

th

e S

.A.C

. Po

rt (

21)

or

a f

oo

tsw

itch

co

nn

ect

ed

to

jack

(23).

Th

e M

ast

er

B c

on

tro

l p

ot

is lo

cate

d o

n t

he f

ron

t p

an

el o

f th

e C

om

bo

am

p.

Fo

r m

ore

deta

ils a

nd

pra

ctic

al h

ints

refe

r to

pag

e 1

0-O

M!

the t

ub

es

an

d t

heir

fu

nct

ion

:V

1 - E

CC

83 (

12A

X7):

in

pu

t st

ag

e, 2. g

ain

sta

ge; g

rad

e: FQ

sele

cted

V2 - E

CC

83 (

12A

X7):

Ch

an

nel 2 d

river

stag

e, 4. st

ag

e; g

rad

e: se

lect

ed

V3 - E

CC

83 (

12A

X7):

FX

bu

ffer

stag

e, p

ow

era

mp

dri

ver

stag

e; g

rad

e: se

lect

ed

V4 - E

CC

83(1

2A

X7):

ph

ase

sp

litte

r; g

rad

e: st

an

dard

V5, V

6: EL34: p

ow

er

tub

es,

po

wera

mp

, m

atc

hes

set

Tu

be M

ap

:

Gerä

teb

au

Gm

bH

Germ

an

yIn

tern

et:

htt

p:/

/w

ww

.en

gl-am

ps.

co

m

Text,

desi

gn

, g

rap

hic

s an

d layo

ut

by

Ho

rst

Lan

ger,

A

mp

Desi

gn

er

Tu

be r

ep

lace

men

t re

po

rt:

1. R

ep

lace

d o

n: _ _

_ _

_ _

_ 20 _

_ _

R

ep

lace

d b

y: _ _

_ _

_ _

_ _

_ _

_ _

_ _

Rep

lace

d t

ub

es:

_ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

Reaso

n: _ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

2. R

ep

lace

d o

n: _ _

_ _

_ _

_ 20 _

_ _

R

ep

lace

d b

y: _ _

_ _

_ _

_ _

_ _

_ _

_ _

Rep

lace

d t

ub

es:

_ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

Reaso

n: _ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

3. R

ep

lace

d o

n: _ _

_ _

_ _

_ 20 _

_ _

R

ep

lace

d b

y: _ _

_ _

_ _

_ _

_ _

_ _

_ _

Rep

lace

d t

ub

es:

_ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

Reaso

n: _ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

_ _

V4

V3

V2

V1

Main

s C

on

nect

or

V5

V6

Main

sTra

nsf

orm

er

Ou

tpu

tTra

nsf

orm

er

Rear

pan

el

am

p c

hass

isas

vie

wed

fro

mth

e u

nse

rsid

e

Tube

Amp

Technology

Tube

Amp

Technology

29X

: N

ois

e G

ate

Th

resh

old

Level

Th

is c

on

tro

l act

ivate

s an

on

bo

ard

No

ise G

ate

to

su

pp

ress

an

y e

xce

ss n

ois

e g

en

era

ted

in

Ch

an

nel 2

wh

en

Gain

Bo

ost

is

act

ivate

d.

It e

ng

ag

es

wh

en

yo

u t

wis

t th

e k

no

b c

lock

wis

e t

o a

rou

nd

th

e 3

po

siti

on

.K

no

b s

ett

ing

s fr

om

3 t

o 1

0 s

et

the t

hre

sho

ld (

or

no

ise level)

at

wh

ich

th

is g

ate

tri

gg

ers

to

su

pp

ress

n

ois

e.

Th

e f

urt

her

yo

u t

wis

t th

e k

no

b t

ow

ard

s 10, th

e h

igh

er

the n

ois

e level w

ill b

e a

t w

hic

h t

he g

ate

tr

igg

ers

. W

hen

th

e k

no

b is

set

to 1

0, th

e N

ois

e G

ate

resp

on

ds

to e

xtr

em

ely

hig

h n

ois

e levels

, m

ean

ing

th

at

there

's n

ot

mu

ch o

f a m

arg

in b

etw

een

th

e g

uit

ar

sig

nal an

d b

ack

gro

un

d n

ois

e.

Info

: Th

e t

hre

sho

ld b

ott

om

s o

ut

wh

en

th

e k

no

b is

set

slig

htl

y t

o t

he left

of

the 2

po

siti

on

. To

d

eact

ivate

th

e g

ate

, tw

ist

the k

no

b t

o t

he f

ar

left

or

0 p

osi

tio

n.

Tip

: Th

e N

ois

e G

ate

on

Retr

o T

ub

e h

ead

s ca

n b

e r

em

ote

-co

ntr

olle

d v

ia f

oo

tsw

itch

; th

e N

ois

e G

ate

on

th

e R

etr

o T

ub

e 5

0 C

om

bo

can

no

t.

To

learn

mo

re a

bo

ut

this

an

d g

et

mo

re d

eta

ils o

n t

he N

ois

e G

ate

, se

e p

ag

es

15 a

nd

16 in

th

e O

M.

22X

Fo

ots

wit

ch: FX

Lo

op

, R

everb

Use

th

is jack

to

co

nn

ect

a c

on

ven

tio

nal fo

ots

wit

ch w

ith

tw

o s

wit

chin

g f

un

ctio

ns,

fo

r exam

ple

, th

e

EN

GL Z

-4 (

2 x

off

/on

- S

ing

le P

ole

Sin

gle

Th

row

or

SPST f

or

sho

rt).

Th

is t

yp

e o

f fo

ots

wit

ch lets

yo

u

acc

ess

Main

FX

Lo

op

on

/off

an

d R

everb

on

/off

. O

ne o

f th

e t

wo

sw

itch

es

en

ab

les

or

byp

ass

es

Main

FX

Lo

op

, w

hile

th

e o

ther

swit

ches

the r

everb

un

it o

n a

nd

off

.N

ote

als

o: A

fo

ots

wit

ch m

ay b

e e

qu

ipp

ed

wit

h L

ED

s in

dic

ati

ng

th

e g

iven

sw

itch

ing

sta

tus.

Each

of

the

two

sw

itch

es

is p

rovid

ed

wit

h a

pp

rox. 10 m

illia

mp

ere

s cu

rren

t, w

hic

h s

uff

ices

to p

ow

er

a s

tan

dard

LED

. Th

e jack

's m

on

o t

erm

inal co

ntr

ols

Main

FX

Lo

op

on

/off

, w

hile

th

e s

tere

o t

erm

inal co

ntr

ols

Reverb

o

n/o

ff (

for

pin

ass

ign

men

ts, se

e p

ag

e 2

2-O

M; at

the C

om

bo

Am

p t

erm

inal "R

" co

ntr

ols

Reverb

off

<->

o

n via

jack

22X

).

37X

, 38X

Po

wera

mp

Ou

tpu

t, 8

Oh

ms

Para

llel

8 o

hm

s sp

eaker

ou

tpu

t ja

cks,

in

tern

al co

nn

ect

ed

para

llel; t

he in

tern

al 8 o

hm

s sp

eaker

(co

mb

o: 1x12",

8

oh

ms)

is

con

nect

ed

to

on

e o

f th

is t

wo

jack

s. T

he im

ped

an

ce o

f an

ad

dit

ion

al ca

bin

et

sho

uld

bear

8 o

hm

s (f

or

the R

etr

o

Tu

be C

om

bo

am

p).

Sp

eaker

an

d c

ab

inet

op

tio

ns

(co

mb

inati

on

of

the in

tern

al sp

eaker

an

d a

n e

xte

rnal ca

bin

et)

fo

r th

e

Retr

o T

ub

e C

om

bo

am

p o

nly

:1. In

tern

al sp

eaker

(1x12",

8 o

hm

s) o

nly

, c

on

nect

ed

to

an

8-o

hm

jack

(w

ith

ou

t an

exte

rnal sp

eaker

cab

inet!

); Su

mm

ary

: N

o e

xte

rnal ca

b; in

tern

al 8 Z

-> in

tern

al to

8-o

hm

ou

tpu

t.2. A

n e

xte

rnal 8-o

hm

cab

inet

an

d t

he in

tern

al sp

eaker

(1x12",

8 o

hm

s) c

on

nect

ed

to

th

e 4

-oh

m jack

s. W

hen

yo

u u

np

lug

th

e c

ab

le f

or

the e

xte

rnal ca

bin

et,

en

sure

yo

u p

lug

th

e in

tern

al sp

eaker

back

in

to a

8-o

hm

jack

! Su

mm

ary

: Exte

rnal 8 Z

+ in

tern

al 8 Z

->

exte

rnal to

4-o

hm

+ in

tern

al to

4-o

hm

ou

tpu

t.

3. A

n e

xte

rnal 16-o

hm

cab

inet

con

nect

ed

to

on

e o

f th

e 8

-oh

m jack

s an

d t

he

in

tern

al sp

eaker

(1x12",

8 o

hm

s) c

on

nect

ed

to

on

e o

f th

e 4

-oh

m jack

s.

W

hen

yo

u u

np

lug

th

e c

ab

le f

or

the e

xte

rnal ca

bin

et,

en

sure

yo

u p

lug

th

e

in

tern

al sp

eaker

back

in

to o

ne o

f th

e 8

-oh

m jack

s! Su

mm

ary

: Exte

rnal 16 Z

+ in

tern

al 8 Z

->

exte

rnal to

8-o

hm

+ in

tern

al to

4-o

hm

ou

tpu

t.

Fo

r d

ivers

e c

ab

inet

op

tio

ns

wit

ho

ut

the in

tern

al sp

eaker

see p

ag

e 1

6-O

M!

Tech

nic

al D

ata

Pag

e 2

1 o

f th

e O

M f

or

the E

762 5

0-w

att

head

als

o a

pp

lies

to t

he E

768 C

om

bo

:A

part

fro

m:

Dim

en

sio

ns:

ap

pro

x. 57 x

44 (

48)

x 3

0 c

m (

l x h

x d

); a

pp

rox. 22.4

" x 1

7.3

6"

(18.9

") x

11.8

" (

l x h

x d

);W

eig

ht:

ap

pro

x. 25 k

g; ap

pro

x. 55.1

lb

s;

Co

nfi

gu

rati

on

tab

le f

or

ass

ign

ing

th

e R

etr

o T

ub

e A

mp

's s

ou

nd

-sh

ap

ing

an

d s

peci

al fu

nct

ion

s to

th

e Z

-9 C

ust

om

Fo

ots

wit

ch's

Fu

nct

ion

s 1 a

nd

2 (

pag

e 2

1-O

M):

A

part

fro

m c

on

tro

llin

g t

he r

everb

syst

em

via

th

e Z

-9 f

oo

tbo

ard

:B

utt

on

a

mp

s's

Fu

nct

ion

s S

etu

p I

nd

icati

on

S.A

.C.

Fu

nct

ion

1 R

everb

off

/ o

n 1: C

han

nel 4 LED

4 lig

hts

F

1-4

Fu

nct

ion

2 R

everb

off

/ o

n 2: C

han

nel 4 LED

4 lig

hts

F

2-4

SERIAL AMPCONTROL PORT

CAUTION:CONNECT CUSTOMFOOTSWITCH Z-9 ONLY!

CHANNEL1 2

GAIN BOOST

FOOTSWITCH

MASTERA / BTONE

FX LOOP

SENDRETURNBALANCE

DRYEFFECT

POWERAMP OUTPUT

48 OR8 ANDOr >

1 x 8 OHMS2 x 16 OHMS

INTERNAL SPEAKER

1 x 4 OHMS2 x 8 OHMS

816 OR16 AND16 OR >

DO NOT OPEN !

RISK OF ELECTRIC SHOCK !

DO NOT EXPOSE THIS EQUIPMENT

TO RAIN OR MOISTURE !

CAUTION !!

HRB 6238

FX LOOPREVERBOFF-ON

S.A.C. PORT

REPLACE FUSE

ONLY WITH SAME TYPE

AND RATING !

POWER TUBE V6FUSE

POWER TUBE V5FUSE

R

All-tube Guitar Combo AmpRetroTube 50 - E768

designed by Horst Langer

optically refined by Edmund Engl

MADE IN GERMANY

8 OHMS PARALLEL 4 OHMS PARALLEL16 OHMS

1 x 16 OHMS

DO NOT OPEN FUSEHOLDER

WHILE AMP IS SWITCHED ON !

REPLACE FUSES ONLY AGAINST

SAME TYPE AND RATING !

CAUTION !

POWER TUBE FUSES

Amp

Tube

1

page: >6< <--------------------------------- 9 ---------------------------------> >S<<---- 9 ----> <------------------ S ------------------> <------ 10 ------>

151718

20

page: <-- 16 --> <--- S ---> >16< <---------- 15 ---------->

19

16X

353637X

89101112Rev-CH21327X29X

38X2533

23456Rev-CH171428

393031322122X2324

page: >6< <------------------------- 7 --------------------------> >S<>7< >9< >13<

>13< >15<<------ 11 -----> >11< >S< <---12 --->

Explanation: “S” stands for the description of the function in this supplement, while the page number refers to the corresponding page in the Retro Tube operating manual.

CHANNEL

MIDDLETREBLE

TONE

INPUTBASS GAINREVERB

MASTER A

POWER STAND BY

VOLUME

GAIN

BOOST

MIDDLETREBLE

BRIGHT

BASS GAINREVERBVOLUME

MASTER BNOISE GATE

THRESHOLD

POWER

TUBE

FUSE

1

2

CH 2

CH 1

0

1

2

3

45

6

7

8

9

100

1

2

3

45

6

7

8

9

100

1

2

3

45

6

7

8

9

100

1

2

3

45

6

7

8

9

100

1

2

3

45

6

7

8

9

100

1

2

3

45

6

7

8

9

10 0

1

2

3

45

6

7

8

9

10

0

1

2

3

45

6

7

8

9

100

1

2

3

45

6

7

8

9

100

1

2

3

45

6

7

8

9

100

1

2

3

45

6

7

8

9

100

1

2

3

45

6

7

8

9

100

1

2

3

45

6

7

8

9

10

0

1

2

3

45

6

7

8

9

100

1

2

3

45

6

7

8

9

10

www.engl-amps.com

E762/E765/E768 Retro Tube - ENGL Guitar Amplifiers

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Transcript of E762/E765/E768 Retro Tube - ENGL Guitar Amplifiers