Jim,

the panel is manufactured by Sylvannia.

No, the amp seems to be on a dedicated circuit, as you suggest. The house is well divided, with lights and sockets on separate breakers.

The fridge and microwave have their own breaker, separate from the lights in the kitchen.

I'm not so concerned about the lights dimming, if what you're saying is that the voltage drop, as I turn on the amp, is across the board and normal?

I've never noticed the lights dimming when the refrigerator starts, only when the amp turns on, initially and momentarily.

I'll get a pic, this afternoon and send it along. And, I'll do as you advise.

thanks, Jim!

John