Amp blows a fuse after several
minutes of operation.
1. Wires from speaker to amp
shorted.
1. Replace speaker cord.
2. M-34 or 5U4GB power rube
defective.
2. Replace tube.
3. Problem persists. 3. Return amp to dealer or
factory for repair.
Amp blows a fuse immediately
after it is switched “On”
1. Defective 5U4GB rectifier
tube
1. Replace tube.
2. Internal short circuit. 2. Return amp to dealer or
factory for repair.
Distorted sound coming from
only one channel.
1. Overdrive control level set
too high.
1. Reduce control level.
2. Defective preamp module. 2. Replace module with one
known to operate properly.
Distorted sound coming from
both channels.
1. Overdrive control levels set
too high.
1. Reduce control levels.
2. Defective first stage preamp
module.
2. Replace module with one
known to operate properly.
3. Speaker output wires to
amplifier shorted.
3. Replace speaker cord.
4. Pickup, instrument or
connecting cable may be
defective.
4. Substitute cable and instru-
ment with one you know
operates properly.
5. Defective speaker(s). 5. Verify speakers operate
properly by connecting
speaker plug to speaker
output jack on another amp. If
speaker is defective return unit
to dealer or factory for repair.
Distorted sound coming from
both channels.
6. Defective Variable Power
tube (12AU7 near power
transformer.)
6. Remove 12-AU7 Variable
Power tube to check and
replace if necessary.
No reverb coming from
amplifier.
1. Reverb control level(s) set
too low.
1. Increase control level(s).
2. Reverb output wires not
connected to Send/Return
inputs.
2. Ensure output wires
properly connected to rear
panel jacks. Cable with red dot
should be connected to Return
Jack.
3. Defective internal spring. 3. Replace reverb unit.
4. Defective reverb Send or
Return circuits.
4. Return to dealer or factory.
5. Springs are stuck. 5. Tap the reverb tank with
your hand.
Channel Selector Footswitch
does not change channels.
1. Channel Selector on amp.
set to Channel 2 position.
1. Use the panel mounted
Channel Selector to set the
amp in Channel 1 (Indicated
by the red L.E.D.)
2. Defective footswitch. 2. Substitute footswitch with
one known to operate
properly. If found to be
defective, return footswitch to
factory or dealer for repair.
3. Defective internal channel
switching in amp.
3. Return amp to dealer or
factory for repair.
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