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humming is _usually_ an internal grounding problem.
try this:
first:
make sure that that the nuts on the input and output jacks are nice and tight.
test.
if that doesn't do it,
Second:
open up the case carefully....
once open, inspect.
poke around gently on the wires. see if any are disconnected from the circuit board, pots, input and output jacks.
take your time and look at EVERYTHING.
i've seen the inside of some eh stuff and it ain't pretty.
so more than likely, it's just a broken solder connection to one of these points.
of course, if you find a broken joint, yl need a soldering iron to repair it.
good luck
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