Power amp humming - help please

My Krell Kav-3250 power amp has a noticeable slight hum constantly when on - and different pre produces different amount. What could be the culprit?

Thanks in advance...

gongli303-10-2021 4:59pm

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gongli3 OP Details Discussions Posts This discussion Message User 92 posts 03-10-2021 at 09:26pm Copy Comment URL Report Comment Edit Delete The volume doesn't change when I crank the volume up on pre, if that means anything...
gongli3 OP Details Discussions Posts This discussion Message User 92 posts 03-10-2021 at 09:27pm Copy Comment URL Report Comment Edit Delete mijostyn, excuse my extreme ignorance on Hifi, but how do I put a ground cheater on the amp's power cord?
gongli3 OP Details Discussions Posts This discussion Message User 92 posts 03-10-2021 at 09:31pm Copy Comment URL Report Comment Edit Delete The hum is coming from the speakers and not the amp, mijo...
fuzztone Details Discussions Posts This discussion Message User 5,502 posts 03-10-2021 at 10:12pm Copy Comment URL Report Comment Edit Delete Right!!!
lowrider57 Details Discussions Posts This discussion Message User 5,396 posts 03-10-2021 at 11:59pm Copy Comment URL Report Comment Edit Delete Test the amp with a cheater plug, an adapter which removes the ground. https://www.target.com/p/general-electric-2pk-grounding-adapter-polarized/-/A-14442316?ref=tgt_adv_X... If it removes the hum then you have a ground fault somewhere.

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