A disturbing new issue...

[stuwee]

This here old apartment house has a vintage old school HAVAC unit on the roof, there's control units inside each apt, recently I noticed that when I switch on the fan for heat, I get a huge 'THUNK' through the Yammie amp. I've never had it do that, even with the Marantz receiver as a preamp when switched on, it doesn't matter where the amp is plugged in from....I use a grounded extension cord at all the different outlets in the room, WTF???

I'm afraid I'm gonna damage the amp with this crap. For now, I just make sure it's switched off before I turn on the heater fan, I had dedicated curcuits in the old place, this is all new to me...GRRRRRRR!!!!!

 

[laatsch55]

Old school would have had an electromechanical relay to operate the fan. It has a coil big enough to dump some EMI back inb the grid. Do you have power conditioner on line??

 

[Fast Forward]

try turning down the volume control to 0 if your hearing the thump thru the speakers

 

[Rex Everything]

I'd say your amp will not have a problem but your speakers may not like it.