KEL80MONOBLOC

INSTRUCTIONMANUAL

diagrams only

V5-5687

V5a-5687

V5b-5687

V1-EL34 V2-EL34V3-EL34 V4-EL34

100K

1K

27R

330R

39K3W

1M

1W

1W

15K

15K

1W1W

10K

220K

220K3W

82K68K

3.3K 3.3K

3.3K 3.3K

2.2K

1W1W

100R100R 1W1W

180R 180R7W 7W

180R 180R7W 7W

470uF10V

1uF250V

220uF 220uF25V 25V

220uF220uF

25V25V

0.68uF630V

0.68uF630V

0 OHM

8 OHM

4 OHM

OUTPUTTRANSFORMER(O.P.T.)

1

2

5

5

6

7

1

2

9

7

6

3

7

7 7

3

3

4

4

1 1

2 2

3 3

44

5 5

8 8

1 1

2 2

3 3

4 45 5

7 78 8

26

1

12

3

45 6

7

8

91

2

34

5

6

7

1

2

3456

7

8

9

1 11 1

2 22 2

3 33 3

4 44 45 55 5

7 77 78 88 8

1 11 1

2 22 2

3 33 3

4 44 45 55 5

6 66 6

7 77 7

8 88 8

a

kg1

g2g3

h

h

a1

k2

k1

hctg1

g2

hh

a2

a aa a

k kk k

g1 g1g1 g1g2 g2g2 g2

g3 g3g3 g3

h hh hh hh h

nc ncnc nc

V6-6AU6

6.3V dc 6.3V ac6.3V ac 6.3V ac

Views are from underneath valve or valve holderh = heater hct = heater centre tap k = cathode a = anode nc = no connection

100R100R

Point E

Point APoint D Point D

Point BPoint C

Point B

VALVE PIN LAYOUT

Page 7

470pF160V

+

+

+

_

_

_

BR1

BR2

BR3

470uF

470uF

450V

450V

100uF450V

100uF450V

6.3V d.c. for 1 x 6AU6 heaters

6.3V a.c. for 1 x 5687 and 4 x EL34

PCB Pin 3,EL34 grid bias voltage

100uF63V

4700uF16V

PCB Pin 7, 450V

PCB Pin 2

PCB Pin 6

PCB Pin 8

Connected toPCB Pin 8 bya valve base side track

PCB Pin 4

PCB Pin 1

5687

PCB Pin 5, 295V6AU6

510V H.T. to centre tapof output transformer

Ground atcentre earthon P.C.B.

Ground atcentre earthon P.C.B.

Ground atcentre earthon P.C.B.

to point D

to point A to point B to point C

to point E

33K3W

3.9K6W

POWER SUPPLY UNIT

anode resistors

255V 120Vac

120Vac

185V-0v-185V390mA

3.15V-0V-3.15V, 7.5A

R1

R3

R2

R4,

-10V

C1

C2

C3

C4

C5 C6

, 36K 0.66W

13K 0.66W

R30

R26

R24

R27

R23

R21

R22

R20bR20a

R19

R18

R17

R16 R10

R15 R9

R32

2 x Orange

Black

White

Blue

Purple

Red

R6

R5R11

R31

R25

R14 R8

R13 R7

R29

C15

C10 C8

C9C7

C12

C11

C14

C13

225V

225V

125V

130V

1.5V

-10V -10V

-10V -10V

9V 9V

9V 9V

0V-27V100mA

For 230V/240V operation:join windings in series, joinviolet & grey together and insulate. Brown is230V/240V and blue is 0V.

For 110V/ 120V operation:join windings in parallel,join brown & grey together,becoming 110V/120V andjoin blue & viole together,becoming 0V.

V6-6AU6

V4-EL34V2-EL34

V3-EL34 V1-EL34

red

red

black

white

yellow

yellow

grey (thick)

orange

brown

blue

grey(thin)

violet

SIGNAL CIRCUIT

KEL 80 MONOBLOC CIRCUIT DIAGRAM

100R

390R

R28

tab 1tab 2

tab 1 - brown wire from mains lead.tab 2 - brown wire to mains switch.tab 3 - earth wire mains lead.tab 4 - grey wire from mains T.

QUICK TAB GUIDE:

tab 5 - 0V wire from speaker terminal

tab 6 - black wire from O/P T.

tab 10 - signal of signal screened wire.tab 11 - white wire from O/P T.tab 12 - 2 x orange wire from O/P T.

tab 3tab 4

tab 5tab 6

tab 7

PTH

tab 8

tab 9tab 10

tab 11tab 12

tab 13

tab 14

tab 15

tab 16

tab17

tab 18

tab 19

tab 15 - 1 x red wire from mains T.tab 16 - 1 x yellow wire from mains T.tab 17 - 1 x yellow wire from mains T.tab 18 - white wire from mains T.tab 19 - orange wire from mains T.

IDENT - denotes the position, outline, name and orientation of the components and pin labels. COMPONENT SIDE - followsthe route of all the solder tracksthat are on the component side.

KEY:

Diagram shows the position of all the tabs (1 - 19) that have connections external to the PCB. At these tab points insert the terminal pins provided and solder both sides of the PCB, insure they project out onto the component side. Additionally, the diagram shows the position of one pin (PTH) that does not relate to a component. Using a piece of wire, thread through and solder both sides and snip off the excess.

PRINTED CIRCUIT BOARD TAB DIAGRAM

tab 8 - signal of feedback screened wire.tab 7 - ground of feedback screened wire

tab 14 - 1 x red wire from mains T. tab 13 - black wire from mains T.

tab 14 - 1 x red wire from mains T.

tab 9 - ground of signal screened wire.

Page 8

Heater link 1

Heater link 2

link 2

link 4

link 1

link 3

Heater link 5

Heater link 6

Heater link 7

Heater link 8

Heater link 9

Heater link 10

Heater link 11

Heater link 12

Heater link 3

Heater link 4

PRINTED CIRCUIT BOARD HEATER LINK DIAGRAM

PRINTED CIRCUIT BOARD INTER - LINK DIAGRAM

VALVE BASE SIDE - follows the route of all the solder tracks that are on the valve base sideWire links USE BLACK 1/0.16 wire providedWire links USE BLACK 1/1.13 wire provided

KEY:

Please note, that the route of all the links on both diagrams are drawn for ease of view. All links should run their shortest path. For the heater links, all number pairs i.e. Heater link 1 & 2, heater link 3 & 4... should run in twisted pairs To reduce hum levels. N.B. Solder both side of all pins.

Diagram shows the valve base side of the KEL80 PCB and illustrates all the inter PCB links. Link 1 connects PCB pin 1 to pin 2. Link 2 connects PCB pin 3 to pin 4. Link 3 connects PCB pin 5 to pin 6. Link 4 connects pin 7 to pin 8. Position all links on valve base side.

Diagram shows the valve base side of the KEL80 PCB and illustrates the position and route of all the valve heater wiring. Positon all links on valve base side.

Page 9

0 OHM

8 OHM

8 OHM

blue

purple

red

OUTPUT TRANSFORMER

black

orangeX 2

ANODE(1)To tab 6 on PCB

ANODE(2)To tab 11 on PCB

CENTRE TAP(CT) To tab 12 on PCB

PRIMARY SECONDARYWINDINGWINDING

To red post of BFA speaker socket for 8ohm setting and to tab 8

To red post of BFA speaker socket for 4 ohm setting.

NEVER CONNECT RED (8 ohm tap) ANDPURPLE (4 ohm tap) TOGETHER, USE ONE OR THE OTHER OR YOU WILL DISTROY THE OUTPUT TRANSFORMER.

To black post of BFA speaker socket

Schematic diagram, soldering points and fitting of.

120Vac

120Vac

For 230V/240V operation:join windins in series, joinviolet & grey together andinsulate. Brown is 230V/240V and blue is 0V.

For 110V/120V operation:join windings in parallel,join brown & grey together,to become 110V/120V and join blue & violet together,tp become 0V.

195V to tab 14 on the PCB

195V to tab 15 on the PCB

0V to tab 13 on the PCB

0V to tab 18 on the PCB

27V to tab 19 on the PCB 3.15V to tab 16 on the PCB

0V to tab 4 on the PCB

3.15V to tab 17 on the PCB

red

black

red

white

orange

yellowgrey (thick)

yellowblue

grey(thin)

violet

brown

MAINS TRANSFORMER

PRIMARYWINDING

SECONDARY WINDING

Schematic diagram, soldering points and fitting of.

full nut

full nut

Solder tag (chassis earth point)

chassis top surface

bolt

toroidalmains transformer

white

page 10

M4 Bolts

transformer cap

chassis surface

BR1 MAINS HT BRIDGE RECTIFIER

BR3 HEATER BRIDGE RECTIFIER

+

+ +

+

+

+

+

-

-

---

BR2 BIAS BRIDGE RECTIFIER

S E M I K R O N

B500 C3200/2200S K B

84

CHINA824A

2KBP02M3N255

DCW02M

the positive lead is longer than the others

M6 fibre washer

M6 fibre washer

ROBO70uF (M)00Vcc105 C

(-) negative terminal(-) negative terminal

(-) negative terminal

(+) positive terminal(+) positive terminal (+) positive terminal

POLARITY MARKINGS FOR C1 & C2

POLARITY MARKINGS FOR C5 & C6

POLARITY MARKINGS FOR C3, C4, C7-10, C14

FIG 3. SW1 MAINS ROCKER SWITCH

MAINS IN

MAINS OUT

FIG. 2. LAYOUT AND ORIENTATION OF BR1,2 & 3.

FIG. 1. LAYOUT AND ORIENTATION OF THE ELECTROLYTIC CAPACITORS

blue wire frommains transformer

blue wire frommains input lead

brown wire frommains transformer

brown wire from PCB tab 2

CDInput

FIG. 4. EXPLODED VIEW OF HOW TO FIT THE PHONO SOCKET

LEAVE 40cm of exposed 3 core wire for internal wiring

Section of chassisaround mains input hole.

a. push the two parts of the strain relief together.

c. while carrying out a. feed the lead through the input holeand push the strain relief into the hole and it will click into place.

b.insure the position of the strain relief is as the diagram suggest.

FIG.5. FITTING OF STRAIN RELIEF

page 11