marshall amp layout
TRANSCRIPT
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7/26/2019 marshall amp layout
1/4
1
2
3
456
7
89
1
2
3
456
7
89
1
23
4
5
6 7
8
to OT
56
7
8
1
23
4
5
6 7
8
100k
.02.02
1K/5w
100k
V1-3 - 12AX7V4&5 - EL34(red circles indicate heaters)(black arrows indicate grounds)
220k
470pf
470p
f
1.5k
100k
.02.02
10k/2w
10k/2w
.021M
1M
470
10k
.1
100k 82k
56k
20k/2w
47k
10mf/100v
10mf/100v
15k
150k
1N4007
47k
dirtyVolume dirtyGatreblemidbasspresence
.1uf
330k
from choke
50uf cap
to screens(pin6, V4&5)
2 blue wires fromstandby switch
ORHV wires frompower tranny
to chokeOTcenter tap
fromrectifier diodes
2 x 50mfd
filter cap
H.T. Fuse500mA
to H.T. Fuse
50uf cap
50uf cap
Powermatic V2.0
V2V3V5
50uf cap
1uf
180pf
100k
1K/5w V4
5.7k
5.7k
V4.5
V5.5
from PIfrom PI
120v
220v
240v
These canbe used asneeded toconnectprimarys.
Ace Pepper Custom Amps
1ohm/1w
1ohm/1w
test bias w/voltmeterpin 8 to groundmV=mA
1M1M250k25k1M5kdrawing by Ace Pepper 1/13/10
V1.7
fromgain
.02.02
100k
relay AC
1M
relay ANO
relay ANC
100k
relay B - C
relay B - NCrelay B - NO
resonance
1M
25uf/25v
150k 1
50k
speaker +
B+
bridge rectifierfor 100 watters
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7/26/2019 marshall amp layout
2/4
Relay power supply board. from hoffmanamps.com6.3vac connect to amps heater supply. 6 vdc out goes tothe relay coil positive/plus. The relay coil negative/minusis switched to return to the power supply minus andactivate the relay. The footswitch jack is not grounded toprevent hum.
Relay board - top veiw
footswitch jack -must be insulated from chassisuse shoulder washers or plastic Cliff-type jack
T
S
C
from relay - power supply minus
spst switchcan be on front or rear panelswitches channels when no F/S connectedbypassed when F/S is connected
+
-
C NC NO
C NC NO
Another version w/ integrated relay.
power supply minusfrom F/S jack
4700uf/16v +-
4700uf/16v +-
+
-
s
s
6.3vac in
6.3vac in
6 vdc outto relay +
180R
Another idea for a relay power supply. Based on an ideafrom blueguitar.org. With this setup the relay minus can begrounded without causing amp hum, no isolated jack required.
6.3vac
6.3vacto ground
to relay +4700uf/16v +-
1k
100r
100r
39r
39r
Relay A
Relay B
4700uf/16v
+
-
1k
F/S A-C B-C
A-NC
B-NC
A-NO
B-NO
100r
100r
39r
39r
6.3vac
6.3vac
6.3vac
6.3vacto ground
4700uf/16v +-
1k100r
100r
39r
39r
F/S A-C B-C
A-NC
B-NC
A-NO
B-NO
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7/26/2019 marshall amp layout
3/4
1
2
3
456
7
89
1
2
3
456
7
89
1
23
4
5
6 7
8
to OT
7
1
23
4
5
6 7
8
100k
.02
1K/5w
100k
V1-3 - 12AX7V4&5 - EL34(red circles indicate heaters)(black arrows indicate grounds)
220k
470pf
470p
f
1.5k
100k
.02.02
10k/2w
10k/2w
.021M
1M
470
10k
.1
100k 82k
56k
20k/2w
47k
10mf/100v
10mf/100v
15k
150k
1N4007
47k
dirtyVolume dirttreblemidbasspresence
.1uf
330k
from choke
50uf cap
to screens(pin6, V4&5)
HV wires frompower tranny
50uf cap
50uf cap
Powermatic V2.1
V2V3V5
50uf cap
1uf
180pf
100k
1K/5w V4
5.7k
5.7k
V4.5
V5.5
from PIfrom PI
Ace Pepper Custom Amps
1ohm/1w
1ohm/1w
test bias w/voltmeterpin 8 to groundmV=mA
1M250k25k1M5k
drawing by Ace Pepper 1/13/10
V
fromgain
.02.02
100k
1M
100k
resonance
1M
25uf/25v
150k 1
50k
speaker +
relay p/s
f/s jack
w/ onboard relay switching
6.3vac
6.3vacto ground
to relay +4700uf/16v +-
1k
100r
100r
39r
39r
T
S
C
from relay - power supply minus
spcaswby
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7/26/2019 marshall amp layout
4/4
68k
1M
2.7k
1uf
100k
.02
1M
10k
220k
1M
220k
100k .02
220k
220k 10k
1M
relay A
100k
1.5k1uf
100k
470pf
.02
.02
47k
25
0k
1M
50k
1M
220k
470
1M
1M
10k
82k
100k
4.7k
4.7k
1r/1w
1r/1w
3A fuse
110
120
200
220
240
L
N
GND
10
K
10
K
150K
150K
+ +10uf/100v
X2
50uf X2500V+
.5A HT fuse
standby
1k/5w
1k/5w
20k/3w
50uf
10k/3w
50uf 50uf
10k/3w
25uf
5k
.1uf
.1
.02
.02
.02
47k1M
relay B
highs
lows
mids
hotvolumeho
tgain
coolvolume
150k
15k
47k
6.3 vac to heaters
100
100
39r
39r
footswitch jack
+ -from relay coil
4.7k
5uf
main power
180pf
Ace Pepper Custom AmpsPowermatic V2.1 drawing by Ace Pepper 1/14/10
spst toggle
C
NCNO
presence
resonance
4700uf/16v1k
345vac 485vdc