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

tech@tubedepot.com

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

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

tech@tubedepot.com

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