Van,
Before you do anything I strongly suggest you findout what
the deal really is.
Either build a long accoustical listening tube, push on the
choke, transformer or chassis, or unbolt the iron from the
chassis and see what happens when you lift it off the
chassis a bit. Tightening a few screws won't hurt, but stay
away from doing thing that might tear the thing up unless
you have no other resort.
I know the mjority are resigned to the fact it is something
in the transformer loose, and it could well be, but the hum
you describe is very common even in a tight transformer when
it is on a steel chassis or near a steel cabinet.
Especially watch the choke, because chokes have intentional
air gaps in the core that cause very high levels of flux
fringing.
Although it might be something else, I'd look at the choke
before anything.
73 Tom
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