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British 18W Layout 12AX7 Version layout by Robert Hull pot has rear mounted SPDT switch all capacitors are 400V unless otherwise stated all resistors are 1/2W unless otherwise stated all wire is 20 gauge, 600V unless otherwise stated Refer to link below for parts list and full assembly instructions Refer to link below for full sized turret board construction template(s) http://tubedepot.com/kit-british18wcombo.html [email protected] T1 47K 47pfd 470K .01 .01 47ufd 50V 22ufd / 450V 150 / 10W 8.2K R6 T2 C1 R1 100K 820 47ufd 50V .0047 .01 .01 470K 470K R16 C10 R21 R20 8.2K 100K 47ufd 50V 68K 470K 470K 8.2K 68K .022 .047 .0047 820 470K 470K .022 .022 .022 1 2 3 4 5 6 6 7 8 1 2 3 4 5 6 6 7 8 1 2 3 4 5 6 6 7 8 1 2 3 4 5 6 6 7 8 1 2 3 4 5 6 6 7 8 1 2 3 4 5 6 6 7 8 power standby fuseholder 1A SB fuse VOLUME TONE 500 pfd .0047ufd VOLUME TONE SPEED 1M 1M 100K 33K 33K wire from fuse holder wire to pwr switch AC safety grounding point power grounding point 16 8 4 com grounding washer soldered to buss wire braided shield mount terminal under stand-off impedance selector High Voltage w/ CT 6.3V filament w/ CT 5.0V/6.3V rectifier filament 120 / 230 AC input .0047 100K INTENSITY 500mA speaker output jacks vibrato on/off footswitch jack AC input EZ81 220K output transformer secondary wires output transformer primary wires EL84 V5 EL84 V4 V6 12AX7 V1 12AX7 V2 12AX7 V3 1st gain stage phase inverter oscillator & 2nd gain stage power transformer T1 F2 C18 6.3V pilot lamp R30 F1 C17 R27 R29 R28 R31 C19 R26 R24 R23 R25 R32 C15 C14 R8 R9 C20 C8 C9 C7 R19 R18 C5 R22 C11 C6 C16 C4 C2 C3 R15 R13 R12 R11 R10 T4 T3 T7 T6 T5 J1 J2 J3 J4 VR1 VR2 VR3 VR4 VR5 VR6 SW1 SW2 Cx3 Cx2 Rx4 Rx3 Rx2 Rx1 Rx5 J5 J6 J7 SW4 500K-A 1K-L 1M-L 500K-A 500K-A 500K-A use terminal when shock mounting tube socket T11 T13 T15 T19 T9 T21 T23 T27 T25 T31 T33 T35 T29 T37 T39 T49 T55 T45 T47 T51 T53 T43 T57 T8 T10 T14 T12 T18 T20 T22 T24 T16 T28 T30 T34 T32 T38 T36 T44 T48 T41 T42 T50 T40 T56 T52 T46 T58 T26 T17 T54 100K T59 T60 18AWG 18AWG 18AWG 18AWG 18AWG 18AWG 18AWG 18AWG signal grounding point 1M connect to "A" on rear of tremolo intensity control tremolo range switch mounted on front panel (optional mod) "A" 20AWG buss wire

British18w Wiring Diagram

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Page 1: British18w Wiring Diagram

British 18W Layout12AX7 Version

layout by Robert Hull pot has rear mountedSPDT switch

all capacitors are 400V unless otherwise statedall resistors are 1/2W unless otherwise stated

all wire is 20 gauge, 600V unless otherwise stated

Refer to link below for parts list and full assembly instructionsRefer to link below for full sized turret board construction template(s)

http://tubedepot.com/kit-british18wcombo.html

[email protected]

T1

47K

47pfd

470K

.01

.01

47uf

d50

V

22uf

d / 4

50V

150

/ 10W

8.2K

R6

T2

C1

R1

100K

820

47uf

d50

V

.004

7

.01

.01

470K

470K

R16

C10

R21

R20

8.2K

100K

47uf

d50

V

68K

470K

470K

8.2K

68K

.022.047

.004

7

820

470K

470K

.022 .022 .022

1 23

4

56

6

78

1 23

4

56

6

78

1 23

4

56

6

78

1 23

4

56

6

78

1 23

4

56

6

78

1 23

4

56

6

78

pow

er

stan

dby

fuseholder1A SB fuse

VOLUMETONE500 pfd

.0047ufd

VOLUMETONESPEED1M1M

100K

33K

33K

wire from fuse holderw

ire to

pw

r sw

itch

AC safetygroundingpoint

powergroundingpoint

16

8

4com

grounding washersoldered to buss wire braided

shield

mount terminalunder stand-off

impedanceselector

HighVoltagew/ CT

6.3Vfilamentw/ CT

5.0V/6.3Vrectifierfilament

120 / 230AC input

.004

7

100K

INTENSITY

500m

A

speaker output jacks

vibrato on/offfootswitch jack

AC input

EZ81

220K

outp

ut tr

ansf

orm

erse

cond

ary

wire

s

output transformerprimary wires

EL84V5

EL84V4

V6

12AX7V1

12AX7V2

12AX7V3

1st gainstage

phaseinverteroscillator &

2nd gainstage

power transformerT1

F2

C18

6.3V

pilo

t lam

p

R30

F1

C17

R27

R29

R28

R31

C19

R26

R24

R23

R25

R32

C15

C14

R8

R9

C20

C8C9 C7

R19

R18 C5

R22

C11

C6 C

16

C4

C2

C3

R15

R13

R12

R11

R10

T4

T3T7

T6

T5

J1

J2

J3

J4

VR1VR2VR3VR4VR5VR6

SW

1

SW

2

Cx3

Cx2

Rx4 Rx3

Rx2

Rx1

Rx5

J5

J6 J7

SW4

500K

-A

1K-L

1M-L

500K

-A

500K

-A

500K

-A

use terminal whenshock mounting

tube socket

T11T13T15T19 T9T21T23T27 T25T31T33T35 T29T37T39T49T55 T45T47T51T53 T43T57

T8T10T14 T12T18T20T22T24 T16T28T30T34 T32T38 T36T44T48

T41T42

T50

T40

T56 T52

T46

T58 T26

T17

T54

100K

T59

T60

18AWG18AWG

18AWG

18AWG

18A

WG

18AWG

18A

WG

18AWGsignalgroundingpoint

1Mconnect to "A" onrear of tremolointensity control

tremolo rangeswitch mountedon front panel(optional mod)

"A"

20AWGbuss wire

Page 2: British18w Wiring Diagram

T1

47K

47pfd

470K

.01

.01

47uf

d50

V

22uf

d / 4

50V

150

/ 10W

8.2K

T2

.004

7

.01

.01

470K

470K

R16

C10

R21

R20

8.2K

100K

47uf

d50

V

68K

470K

470K

8.2K

68K

.022.047

.004

7

820

470K

470K

.022 .022 .022

1 23

4

56

6

78

1 23

4

56

6

78

1 23

4

56

6

78

1 23

4

56

6

78

1 23

4

56

6

78

1 23

4

56

6

78

pow

er

stan

dby

fuseholder1A SB fuse

VOLUMETONE500 pfd

.0047ufd

VOLUMETONESPEED1M1M

100K

33K

33K

wire from fuse holder

wire

to p

wr

switc

h

AC safetygroundingpoint

powergroundingpoint

16

8

4com

grounding washersoldered to buss wire braided

shield

mount terminalunder stand-off

impedanceselector

HighVoltagew/ CT

6.3Vfilamentw/ CT

5.0V/6.3Vrectifierfilament

120 / 230AC input

.004

7

100K

INTENSITY

250m

A

speaker output jacks

vibrato on/offfootswitch jack

AC input

6CA4EZ81

220K

outp

ut tr

ansf

orm

erse

cond

ary

wire

s

output transformerprimary wires

EL84V5

EL84V4

V6

EF86V112AX7

V2

12AX7V3

1st gainstage

phaseinverteroscillator &

2nd gainstage

power transformerT1

F2

C18

6.3V

pilo

t lam

p

R30

F1

C17

R27

R29

R28

R31

C19

R26

R24

R23

R25

R32

C15

C14

R8

R9

C20

C8C9 C7

R19

R18 C5

R22

C11

C6 C

16

C4

C2

C3

R15

R13

R12

R11

R10

T4

T3

T7

T6

T5

J1

J2

J3

J4

VR1VR2VR3VR4VR5VR6

SW

1

SW

2

Cx3

Cx2

Rx4 Rx3

Rx2

Rx1

Rx5

J5

J6 J7

SW4

500K

-A

1K-L

1M-L

500K

-A

500K

-A

500K

-A

T11

T13T15T19

T9

T21T23T27 T25T31T33T35 T29T37T39T49T55 T45T47T51T53 T43T57

T8T10T14 T12T18T20T22T24 T16T28T30T34 T32T38 T36T44T48

T41T42

T50

T40

T56 T52

T46

T58 T26

T17

T54

100K

R5R1

R6

2.2K10

ufd

450V

.1

C1

47uf

d50

V

C22

C21

R33

220K

useterminal

whenshock

mountingtube

socket

British 18W LayoutEF86 Modified Version

layout by Robert Hull pot has rear mountedSPST switch

Refer to link below for parts list and full assembly instructionsRefer to link below for full sized turret board construction template(s)

http://tubedepot.com/kit-british18wcombo.html

[email protected]

18AWG18AWG

18AWG

18AWG

18AWG

18A

WG

18AWG

18A

WG

18AWG

all capacitors are 400V unless otherwise statedall resistors are 1/2W unless otherwise stated

all wire is 20 gauge, 600V unless otherwise stated

signalgroundingpoint

1M