SESSION 77

OWNER’S MANUAL

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T h an k y o u fo r p u rch as in g th e PJ B S ES S I ON 77 .

P h i l J ones Bas s h a s b een b u i l d ing b a s s amp l i f i e r s f o r t he mo s t demand ing o f

b a s s i s t s . P h i l t h ough t i t w as abou t t ime t ha t a ba s s amp tha t d e l i ve r ed t he

t r u e t o n e o f a ba s s i n s t ru men t , l i k e y o u have neve r h ea r d b e f o r e w i th o n e

ma jo r d i f f e r en ce . I t w ou ld b e t he mos t a f f o rdab l e ba s s amp ye t . We loo k ed

i n to t he mo s t e f f i c i en t w ay w e cou ld bu i l d an amp w i th ou t s ac r i f i c i n g t he

mos t impo r t an t a s p ec t : TO N E!

I t i s l oud enoug h t o w ork w i th mos t d rummer s an d co mp ac t enoug h t o be

u s ed an y w he re .

T h e t w o s u p e r h i g h - e f f i c i e n c y a n d p r o p r i e t a r y 7 - i n c h s p e a k e r s w e r e

d e s ig n ed by P h i l J ones t o ge t t h e mos t o f t he 1 0 0 w a t t s c l a s s D amp l i f i e r.

Thes e 2 amaz ing w oo f e r s a r e comp l imen ted by ou r h igh ene rgy 3 - i nch K

h ig h f r equency t r an s duce r. We have u s ed t h i s s peake r i n t hous an d s o f PA

s p eak e r s and have p r o v en t o be b low ou t p r o o f . The r e s pon s e o f t h i s s p eak e r

s y s t em i s o f t he h ighes t f i de l i t y f r o m 30 H z to 20K H z an d t h a t means i t d o es

n o t o n ly s ound g r ea t w i th ba s s b u t an y i n s t rumen t t h a t p lu g s i n to i t .

The s e s s ion 7 7 i s a s i n g l e ch an ne l , ba s s amp l i f i e r, 10 0 w a t t s o u tp u t . By

u s in g a l l d ig i t a l c i r cu i t r y t h e amp w i l l w o r k on any A C v o l t ag e f r o m 1 0 0 t o

2 6 0 Vo l t s w i th o u t t h e need o f a s e l ec to r. D ig i t a l c i r cu i t s a r e f a r more

e f f i c i en t t h a t t h e o ld an a lo g co u n t e r p a r t s an d t h e bene f i t i s l e s s w as t ed

p o w er a s h ea t , t h u s g iv ing t h e amp a g r ea t e r l o n g ev i t y. H ea t i s an amp l i f i e r ' s

w o r s t en emy s in ce i t s l o w ly k i l l s e l e c t r o n i c co mpo n en t s .

We d id n o t s k imp on qua l i t y o f p a r t s e i t h e r ; w e j u s t r edu ced do w n to t he

b a s i c needs o f mo s t b a s s p l ay e r s . To en s u re l o n g ev i t y w e equ ipped t h i s amp

w i th a s o l i d k i ck p roo f a co u s t i c a l l y t r an s pa ren t , cu r v ed s t e e l g r i l l . Th i s amp

u s e s t he s ame l ev e l o f q u a l i t y p a r t s f ound o n a l l P J B amp s . O ur goa l w as t o

g e t t he be s t s o u n d ing , mos t r e l i ab l e amp a t an unbea t ab l e p r i c e .

READ THIS FIRST

�Before using the SESSION 77 please read ALL the instructions.

�On receipt of product, check for any signs of physical damage arising from

shipping. If any damage is visible contact your dealer.

�Do not install this equipment in a confined or building-in space such as a

book case or similar unit, and remain a well ventilation conditions at open

site. The ventilation should not be impeded by covering the ventilation

openings with items such as newspaper, table-cloths, curtains etc.

�WARNING: Only use attachments/accessories specified or provided by the

manufacturer (such as the exclusive supply adapter etc).

�WARNING: Please refer the information on exterior bottom enclosure for

electrical and safety information before installing or operating the

apparatus.

�WARNING: To reduce the risk of fire or electric shock, do not expose this

apparatus to rain or moisture. The apparatus shall not be exposed to

dripping or splashing and that objects filled with liquids, such as vases,

shall not be placed on apparatus.

�WARNING: The appliance coupler is used as disconnect device, the

disconnect device shall remain readily operable.

�When not in use and during movement, please take care of the power

cordset, e.g. tie up the power cordset with cable tie or something like that.

It shall be free from sharp edges and the like that can cause abrasion of the

power cordset. When put into use again, please make sure the power

cordset being not damaged, If any damages found, please look for the

service person to replace the power cordset specified by the manufacturer

or have the same characteristics as the original one.

� Correct Disposal of this product. This marking indicates that this

product should not be disposed with other household wastes throughout

the EU. To prevent possible harm to the environment or human health

from uncontrolled waste disposal, recycle it responsibly to promote the

sustainable reuse of material resources. To return your used device, please

use the return and collection systems or contact the retailer where the

product was purchased. They can take this product for environmental safe

recycling.

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FRONT PANEL DESCRIPTION

1. BASS INSTRUMENT INPUT JACK.

This is a standard ¼ inch mono jack socket.

For the best possible sound we recommend you use the PJB BI-12 instrument cable as it

has very low self-capacitance and absolute shielding resulting in greater transparency of

sound and less noise.

2. LED CLIP/MUTE INDICATOR.

When the amplifier output is clipping, the LED will light up with red. When the amplifier

muted, the LED will light up with green

3. INPUT /MUTE SWITCH.

Top Position: Mute On

Middle Position: Low sensitivity for mainly active basses.

Bottom position: High sensitivity for passive basses.

4. INPUT LEVEL ADJUSTMENT.

Different instruments and also different playing styles and even players will affect the

signal level so adjust this control so that the signal overload Clip light does not light up.

This optimizes the best signal to noise ratio between amp and instrument and will give

you the full extent of the amplifiers tone and power.

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FRONT PANEL PANEL OVERVIEW

POWER

ON

OFF

MAXMIN

MASTER VOL.

MIN MAX

CLIP

+18dB-18dB+18dB-18dB-18dB +18dB

LOW

MUTE

HIGH

INPUT LEVEL BASS MID TREBLE

INPUT

MIN MAX

HEADPHONEAUX INPUT

LINE OUT

PHIL JONES BASS

SESSION 77

LEVEL

1 2 3 4 5 6 7 8 9 10 11 12 13 14

0 0 0

5.BASS CONTROL.

This is centered on the fundamental frequencies of 4 and 5 string basses. Boosting or cutting this will have significant effect on the weight of the tone.

6.MID RANGE CONTROL.

This gives the "voice" of your instrument. Generally you will find that cutting this control instead of boosting will have more of a truer bass sound. Boosting may be useful for soloing or special effects.

7.TREBLE CONTROL.

This gives the instrument the definition to the sound. Boosting it for "slap" bass or cutting back for "Reggae" bass sound.If you boost excessively you may get more noise as hiss and that could be due to the noise coming from the pre amp in your bass or a poorly shielded instrument cable. PJB has a dedicated bass instrument cable (Model BI-12) that is totally noise free and actually will improve the tone of your instrument.

8.MASTER VOLUME CONTROL.This is the master volume control and it controls how much power you send to your speakers as well as the line out socket on the back of the amp. When setting up your tone or plugging in your instrument, you should keep this control at a low level. All instruments are different when it comes to how much output is from the pickups. Likewise for players, depending on how hard or soft you play. Note this control is a true “Audio Taper” control so that the level position may be set higher compared to other amps that use a “Linear Taper” control. The “Audio Taper “ control has far more precision in controlling your output and uses the full rotation to control level, unlike Linear controls that just use the first few degrees of turn and give the impression the amplifier has more volume than what it actually has.

9.AUXILIARY INPUT LEVEL CONTROL.Adjusts the level of aux source.

10.AUXILIARY INPUT

This is a stereo mini-jack input for audio source. This can also be connected to the headphone out of a PJB BIG HEAD giving this amp then a 2 channel capability.

11.PRE AMP LINE OUT.

This output can be used to drive a PJB powered cabinet such as the PB-100 or PB-300.The PB-100 would be an ideal monitor and the PB-300 would be augmenting the power from the SESSION-77 to add more authority to your tone. It can also be used to power another instrument amplifier or power amplifier. This can also connect up to a passive DI box for connecting up to a PA or Recording console.

We recommend a unit such as the Switchcraft 314 DI box.

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12. HEADPHONE SOCKET (STEREO PHONES).

We recommend the PJB H-850 headphones as they were designed for bass and high fidelity

music reproduction. They are a perfect match to the SESSION 77

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When a headphone is connected to the jack, the speaker output will be disconnected and the speakers will be muted.

13. POWER SWITCH.

This switches off the amplifier from the DC supply but AC signal will still be in the internal supply. We advise that you disconnect the power supply from AC source if you do not intend to use the unit for long periods of time.

14. POWER INDICATOR.

Will light up when you have DC supply connected and amp switched on.

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OPERATION & POSITIONING

TURN THE VOLUME DOWN or switch the Mute on the SESSION 77 before plugging

in your instrument.

ALWAYS USE A HIGH QUALITY GROUNDED AC POWER CABLE. NEVER USE

THIS AMPLIFIER WITH THE GROUND CONNECTION REMOVED. We

recommend you use PJB cables for speaker connections as they have virtually no loss

so there is maximum transfer of power from amplifier to speaker.

Loudspeakers also vary in efficiency with frequency. Most loudspeakers are generally

louder in the mid range than in the bass or extreme high frequencies: Which is one reason

why we need EQ in am amplifier. An EQ control is just a frequency selective volume

control: It boosts or cuts level at a specific frequency. So excessive boosting of

frequencies, especially on bass frequencies where almost 90% of the amplifier power is

used can rob a bass system of headroom.

Amp positioning and EQ

Nearly all bass speakers are Omni-directional at all the fundamental tones of a bass: that

is from about 200Hz (that's the fundamental of a G string on 12 Fret) all the way down to

the lowest frequency a speaker can reproduce. The open E is 41.2Hz and open B string is

31Hz.

Mid range and high frequencies tend to be directional which is why many players angle

their cabinets to ear level so they can hear the definition better.

Because bass frequencies radiate all around the cabinet, the bass will sound weaker when

the cabinet is placed on a large stage with no boundaries. By placing the speakers close to

a wall or even to a corner, the bass frequencies will appear to be much stronger and it may

not need to have much boost on EQ allowing the amp to have more headroom.

By careful positioning of your bass speakers, you may be able to get a fuller low

frequency without the use of boosting too much EQ. This will give not only your amp

more headroom but will put less stress on your speakers.

Keeping the cabinet on the floor will give deeper bass than if it is placed on a stand or

chair as the floor reinforces the low frequencies.

TRANSPORTING AND STORING THE SESSION 77

When transporting or storing the SESSION 77, it is recommended that you always use the

optional cover (not included). A dedicated cover can be purchased separately.

When Storing:

�Keep in a dry location preferably at room temperature in the gig bag.

�Do not store in temperatures below -20 Degrees C or above 40 Degrees C.

�Do not allow it to get wet. If this occurs, never turn it on in this condition.

�Do not leave the SESSION 77 permanently connected to a power source.

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SPECIFICATIONSAmplifier

100 watt D class amplifier with digital switch mode power supply.

Frequency Response

30Hz -20KHz

Signal to Noise Ratio

Better than 84dB (EQ center, Volume on Full.)

Impedance

High Input: >500KΩ/22pF Low

Input: >30KΩ/22pF

Pre Amp Line Out: < 2KΩ

Levels

High Input: 30mV-2V

Low Input: 50mV-1.5V

Pre Amp Out: 1.2V

VENTED ENCLOSURE

2 x7 inch PJB Ferrite Speakers + 1 x PJB 3 inch Tweeter.

Crossover Frequency 4KHZ@ 6dB/Octave

Weight: 27.5lbs

Dimensions: 17inches wide x 11.5 inches high x 14.3inches deep.

Included Parts

6 ft AC Power Cord.

SERVICE/WARRANTY INFORMATION

PJB amplifiers carry a 2 years limited warranty on parts and labor. Products must be purchased from an authorized PJB dealer.Buyer must complete and return the enclosed warranty card within 15 days of purchase, or register online by

This warranty covers defect in materials or workmanship that occurs in normal use. Within warranty period PJB or its local distributor will repair or replace the defect unit free of labor and parts charge. It is the buyer’s responsibility to use the unit strictly according to instructions written in the owner’s manual.

This warranty is not transferable; it is provided to original owner only.

Damage/defects caused by the following conditions are not covered by this warranty:• Improper handling, neglect or failure to operate the unit in compliance with the

instructions given in user manual;• Connection or operation in any way that does not comply with the technical or

safely regulations applicable in the country where the product is used;• Repairs or modifications by anyone other than authorized PJB service agent;• Damages/defects caused by force majeure or any other condition that is beyond the

control of PJB.

IMPORTANT:

In all warranty issues your first line of communication should be to the retailer you purchased from, even if you have purchased product from an online source.

When a local distributor is available, customer who prefers to purchase across country online maybe required to pay shipping charges to retailer in order to obtain service.

Further questions, please contact PJB by email info@philjonespuresound.com, or call 314-814-3383.

www.philjonespuresound.com/support/register

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IN USAAmerican Acoustic Development LLC 8509 Mid County Industrial Drive, St.Louis MO 63114 USA Tel: Sales-314 814 3383; Service/Repairs-314 814 1264Fax: 656 536 1338www.pjbworld.com support@philjonespuresound.com

For servicing outside USA please contact our distributor in your country.

Information can be found on our website.

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PHIL JONES BASS8509 Mid County Industrial Dr / St Louis, MO 63114 USA Phone: 314-814-3383Fax: 636-536-1338www.pjbworld.com

Printed in China