cable not properly
grounded
cable is plugged into
instrument
3) EL-34 power tube
shorted
3) Replace EL-34
Amp blows a fuse after
several minutes of
operation
1) Wires from speaker to
amplifier shorted
1) Replace speaker cord
2) EL-34 or 5U4GB
power
tube defective
2) Replace tube
3) Problem persists
3) Return amp for repair to
dealer or factory
Amp blows a fuse
immediately after it is
switched ON
1) Defective 5U4GB
power
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
setting
2) Defective preamp
module
2) Replace module with one
known to operate properly
Distorted sound coming
from both channels
1) Overdrive control level
set too high
1) Reduce control level
setting
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
instrument 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 detective
return unit to dealer or
factory for repair
6) Defective Variable Power
tube (12AU7 near power
transformer)
6) Remove 12AU7 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
reverb unit
3) Replace
4) Defective reverb Send or
4) Return to dealer or
