Page 1
68 k
1M
1k5
2.2uF
100v
220k
100pF
2k7
100k 100k
4.7nF
2.2nF
.022uF
470k
220k
470pF
68k
220pF
.1uF
.033uF
250k lin
250k
log
22k
1M
1M
1k5
100k
47k
.1uF
1M
1K5
220k
To power
amp
Effects send and return
Input sockets
v1a
v1b v2a v2b
v3a
v3b
Vintage
channel
volume
G
G F F
E E
.033uF
.022uF
To
Reverb
Input
All resistors are ½ w unless otherwise noted. All caps
400v min. unless otherwise noted.
25k lin
1k5
1k5
1M log
1M log
220k
SPCO
Relay
470pF
470k
470k
68 k
68 k
680k
220k
5 Volts
To Footswitch
Jack Socket
250k
log
250k
log
DPCO
Relay
5 Volts
1k5
To Footswitch
Jack Socket
To Mute Circuit
.033 uF
Red LED
100k
1k5
Green LED
1N4007
1N4007
Mute Point
Cornford Hellcat Preamp and Effects Loop
1nF
10 ¾ W
47uF 450V
10 ¾ W
47uF 450V
Issue:
Project:
Drawing No:
Title:
Date:
Drawn By:
Issue: Description of changes:.
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A
B
C
D
E
1 2 3 4 5 6
E
D
C
B
A
1 2 3 4 5 6
A
MK
03/08/11
Hellcat Schematic
Page 2
Cornford Hellcat Reverb Circuit
All resistors are ½ w unless otherwise noted. All caps
400v min. unless otherwise noted.
Input to Reverb
from Treble
Wiper
Issue:
Project:
Drawing No:
Title:
Date:
Drawn By:
Issue: Description of changes:.
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.
.
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.
A
B
C
D
E
1 2 3 4 5 6
E
D
C
B
A
1 2 3 4 5 6
330k
3.3k
1.5K
Reverb tank
Reverb Transformer
v5b
v5a
2.2uF
100v
2.2uF
100v
2.2nF
To Master
Volumes
100k
4n7
1M log
Ring and sleeve of
stereo f/switch jack
470k
470pF
E
C
A
MK
03/08/11
Hellcat Schematic
Page 3
Input from
Master
Volumes
150k
Cornford Hellcat Power Amp Section
All resistors are ½ w unless otherwise noted. All caps
400v min. unless otherwise noted.
Issue:
Project:
Drawing No:
Title:
Date:
Drawn By:
Issue: Description of changes:.
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.
.
.
.
A
B
C
D
E
1 2 3 4 5 6
E
D
C
B
A
1 2 3 4 5 6
100K 100K
100pF
1M
1M
.033uF
.033uF 10K
10K
100 ohm
1W
100 ohm
1W
68 ohm
7W
100 uF
63V
.1uF
Output
Transformer
16 ohm
8 ohm
4 ohm
Speaker
Outputs
Speaker Impedance
Selector
C
B+
D
V6 & V7 EL 84
6BQ5
V8 & V9 EL84
6BQ5
V4 a & b
.022uF
220k
220k
10k
4k7
To 8 Ohm Tap
470R
A
MK
03/08/11
Hellcat Schematic
Page 4
Cornford Hellcat Power Supply
Mains inlet
DPST
Mains
Switch
Mains Transformer
50+50uF Dual
Section 500 Volt
Electrolytic
470 ohm
3W
2k2 3W
10k 3W
T 500 m. A.
DPST
Standby
Switch
B+ C
4x 1N4007
2200uF 16v
Dotted lines indicate parallel wiring for
115 volt operation
Mains fuse is T2A for
115v and T1A for
230v
Br
Gry
Or
Blu
Br
Blu
220k
2W
For 230 Volt operation wire orange
and grey wires together for series
connection
7805
4x 1N4007
All resistors are ½ w unless otherwise noted. All caps
400v min. unless otherwise noted.
5 Volt Supply
50+50uF Dual
Section 500 Volt
Electrolytic
D E
Issue:
Project:
Drawing No:
Title:
Date:
Drawn By:
Issue: Description of changes:.
.
.
.
.
.
A
B
C
D
E
1 2 3 4 5 6
E
D
C
B
A
1 2 3 4 5 6
A
MK
03/08/11
Hellcat Schematic
6.3vac To all valve heaters
265vac
12vac
CT
Page 5
Cornford Hellcat Mute Circuit
5 Volts
220k
.033 uF
Mute signal from
preamp relay
Mute Point
2N5462
MAC97
All resistors are ½ w unless otherwise noted. All caps 400v min. unless otherwise noted.
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