by erichayes » Sat Nov 03, 2007 10:12 pm
Hi K,
A lot--two words. Sorry for being picky.
In general, I agree with Tom. The main exception for me is with my smaller amps that don't use delayed or manual B+ activation and do have inrush limiters. If I lose power long enough for the 200+ µF capacitors to discharge, but not long enough for the IRCL to cool off sufficiently--usually around 4 or 5 seconds--I'll pop the line fuse every time. That's the only reason I have the one I use for the telly on a UPS. Otherwise, what Tom says.
As far as radiated interference from high tension power lines is concerned, that usually enters the system upstream of the power amp. You can verify this by disconnecting the inputs from the power amp and inserting shorting plugs in their place. If you are still experiencing hum/noise problems, you need to go through the amp and reexamine your grounding and lead dress. If all's well with the amp, then the obvious next step is to check the viability of the interconnects and whatever component(s) in front of the amp inputs.
Keep us all informed of your results, and good luck.
Eric in the Jefferson State