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TROUBLESHOOTING GUIDE
SYMPTOM
CAUSE
REMEDY
Hum or "Buzzing" through
speakers
Ground Loop
Intermittent or poor connection
of interconnect ground
Install 2-pin adapter on
A.C. cord to float the
Ground
Replace interconnect
"Popping or Spitting" noise
Noisy tube
If noise is in one channel,
through the speaker swap one
section of tubes at a time until
the noise swaps channels.
Replace noisy tube.
Check bias of output tubes. If
high or fluctuating rapidly,
replace output tube.
(See Bias Adjustment, p 11)
AC fuse blows
Line voltage surge
CV729 shorted
Replace fuse
Replace CV729/5U4
Tube fuse blows
Shorted output tube
Replace tube
11