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