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
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
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
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