it must be the time of year. my amp is also humming.
it must be the trafo because when i push on the top the sound decreases.
my question is (i guess) is it normal for a big amp to humm a little bit.
its a bose 1801 power amp. 2 x 240watts in 8 ohm load.
if done the polarity check.
there are no problems in the hifi chain
i was thinking about tightening the screws of the trafo and maybe put some big nails between the windings ore some sticks (wood) to put more pressure on it.
but is it allowed to humm. i can hear it only when my heads close to the amp.
the bose is great but infamous for blowing op your speakers , so there is a little worry there.