Do all toroidal transformers hum?

Not all, but some.

Amplifier hum problem SOLVED!!!. Gbart was kind enough to make me a simple DC blocker (with high quality Caps and resistors). I received it last night, I plugged the amp into it and VOILA NO MORE HUM. Not even a hint of it. I pressed my ear against the amp. to hear the faintest hum, but nothing, absolute SILENCE. You won't believe how much the DC blocker from Gbart costed... $72. Yes it's just Seventy Two dollats.

THANKS GBART

It was actually caps and a diode bridge, not resistors. :-)

Well Gbart, I told I was a novice :-))

Yes, Try putting neoprene under it. Tweaker