| My twin reverb had a similar problem. The fellow I bought it
from had dropped it off the back of a pickup truck & it was
not improved at all by the experiance (It has Altec 12's that
weigh in at about 30 lbs each). Needless to say, I got it cheap.
After building a new body for the electronics & speakers &
assembling it all, I found the same problem, but it went away
if something that was grounded properly was plugged into the
jack. It turned out to be a bad solder joint between the steel
case and the PC board (you need a big soldering iron to re-heat
this joint). Of course my steel case was bent when I got it,
so I have a good idea why this solder joint was bad.
You might also have a bad ground of some sort if the problem only
occurs when you plug something in. Does this only happen when
certain things are plugged in or when nothing is plugged in or
no matter what is/is not plugged in??
You might try re-heating all of the contacts on the PC board/jacks/
pots with a soldering Iron.
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| Yeah, what he said, and also look for wires flopping around inside
the case that seem to be routed a little close to the transformer
and power tubes. You can cement these things down with blobs of
silicone gel (comes in a tube. Makes for extra insulation, ya know?
Hope this helps a little,
jc
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