2. amps-preamps
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anyone have any experience with Krell Amps humming

I just got a new Krell Theater Amplifier Standard, and when connected to my system it hums at about 52db, it's not ground loop related as it does not vary with volume at all. (at least I think that's correct) I've done everything everyone will suggest from line conditioning all the way down to reverse engineering my sytem and there is no way to eliminate the hum, I can add to it and have identified a couple of other issues I'll have to resolve, but it's always there. Just curious if that level hum is normal, or if anyone else has any experience with Krell like this, and if so, what they did. I'm about to take the amp back for exchange.
arthursmuck
sdcampbell
2,136 posts
 
I don't have any personal experience with Krell amps humming, but a friend of mine says that he occasionally catches his amp humming "I Can't Get No Satisfaction"... (sorry, couldn't help myself).
vegasears
1,173 posts
 
My Krell FPB 200 (I sold it a while back) hummed and I lifted to ground. Here is a simple way to check for a ground loop. Use an adapter plug, three prongs to two prongs. If you don’t have one around the house any supermarket will have one. If that does not work call the nice people at Krell.
rsbeck
887 posts
 
Do you have the Krell plugged into an AC conditioner? If so, try
plugging it directly into the wall. Krell amps, like a lot of amps,
do not like to be plugged into an AC Conditioner and will hum
if plugged into one. Next, do you have all your gear plugged into
a 15 amp circuit that is not dedicated for your system? If so, your
amplifier may be starved for juice or picking up a hum from another
appliance in your home, or even from a neighbor's home. Way to
solve that is with dedicated properly grounded circuits with Hospital Grade outlets for your audio/visual gear. Put your amp
on a separate 20 amp circuit and a separate circuit for the AC Conditioner. If your AC Conditioner is also an isolator, you can
plug the rest of your gear into it. After installing dedicated circuits
all humming is gone, my system is dead quiet, sonics are improved and no more humming.
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