A quick question?

Yup, 60Hz floating thru the transformers & into the speakers... I have it from ONE of the two amps, go figure. As it's barely perceptible with my ear glued to a woofer I don't worry.
Or should I? (Sean?)

I'd try to isolate the problem by connecting components in reverse. Ie start with just the speakers connected to the amp with everthing else disconnected. If no hum then add one item at a time. Ie a pre-amp to amp cable, then the other one then the pre-amp, and continue until you get the hum.

May also need to use ac cheater adapters on each component.

Tranformer hum is usually a 60 cycle vibration. If it were the source, the amp will vibrate and the speaker woofer should be quiet.

Other sources of noise can be anything with a motor, flourescent lights, electronic dimmers, items with high/low switches and computers. Try temporarily disconnecting suspect items to see if hum disappears.

Hope this helps. Hum problems can be aggrevating.

If you have to put your ear to the speaker, it is not a problem. Forget about it.

I used to have a cj11a and there was some hum. It's nothing to worry about. If you can't hear it from where you sit, why worry. I got rid of the hum when I got a new amp - BAT, and no hum.
Steve