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

Showing 8 responses by gongli3

gongli3 OP Details Discussions Posts This discussion Message User 92 posts 03-10-2021 at 09:05pm Copy Comment URL Report Comment Edit Delete I have two of the Krell power amps (for home theatre) and they both make hums when I switch out and connect the same way, with the same cables. Does that mean anything? Perhaps cables or something? (I am so ignorant when it comes to electronics)
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 09:02pm Copy Comment URL Report Comment Edit Delete Thanks again Johnson...
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 09:31pm Copy Comment URL Report Comment Edit Delete The hum is coming from the speakers and not the amp, mijo...
gongli3 OP Details Discussions Posts This discussion Message User 92 posts 03-10-2021 at 05:40pm Copy Comment URL Report Comment Edit Delete Thanks a lot Johnson - I will have to try that - I will be careful as you warned me.
gongli3 OP Details Discussions Posts This discussion Message User 92 posts 03-11-2021 at 08:30am Copy Comment URL Report Comment Edit Delete Thanks so much lowrider! I ordered it. Later, please help me find the ground fault - I have no idea how to do that - excuse my ignorance on electronics...I just love music.
gongli3 OP Details Discussions Posts This discussion Message User 92 posts 03-14-2021 at 07:02am Copy Comment URL Report Comment Edit Delete Lowrider, yes I live in a house with a service panel. The hum is gone!!!!!!! Hooray... I connected it to a different receptacle of my power conditioner, and swaped the pre-amp and the RCA cable, it's black quite background now - now I can enjoy my main system I put so much time / energy/ and money into it... Thank you so much to all those who helped out here! You guys are swell...

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