System feedback coming thru speakers.....help

The sonic character of your noise sounds to me like "popcorn" noise. This is a bad semiconductor or tube, and if it happens with the Nak connected directly to the power amp, my vote is it's in the Nak. If it were in the power amp, you would hear it continually, irrespective of what is connected.

So to clarify, disconnect everything from the power amp, put a shorting plug (if you have one) across the power amp's RCA inputs, and listen. If its gone, reconnect the Nak and re-test. If its back, its the NAK. Do one more final test. Remove the Nak from the power amp and listen again with the input open. If it's back, then it could be a defective device in the input stages of the power amp. This is not likely because the Nak probably has a low enough source impedance (so it would be like the shorting plug).

Dhl93449, it is constant. no matter what the source. I wonder if it isn't actually the amp, as it happens with CD, nak, 2nd CD/DVD, no matter what.

I have a call into Ed at CJ too.

thx!

Have you swapped out the amp? is there a small one you an borrow?

Lloydelee21, as improbable as it seems that an amp in both channels would do this with any input but not without, I think this is the only obvious test.

Tbg,

I hear you...i'm no techie, so just trying eliminate variable's the 'simple man's way'.