2. amps-preamps
  3. 1265762590

Intermittent hum in right Krell fpb 350 mono

Maybe you have experienced this but it is driving me crazy. Everything plays perfect, go to bed, next day, turn on the system and there is a loud hum in the right channel. Switch ICs in the back of the processor and the hum goes to the left channel. wiggle the plug on the amp, turn the amp on and off, wahlla! hum disappears and the system is perfect again. Occasionally that same right channel "fades" so I turn off the amp, wait a few seconds, turn it back on and it is at full strength.

I live in Mexico now so sending the amp in would probably cost more than the purchase price (if I ever got it back). Any thoughts?
puerto

Showing 3 responses by puerto

puerto OP
372 posts
 
I should add that all of the equipment (APC, monos, pre/pro, etc.) are on separate 20 amp circuits. Occasionally switching the amp to a different circuit works, but not always.
puerto OP
372 posts
 
Sidssp I was thinking that since the "right" IC was now in the Left input of the processor that the amp in question was now driving the left channel.
puerto OP
372 posts
 
Sidssp you are correct - I had to think it through! Interesting though that by (sometimes) wiggling the power cord plug on the amp that I can stop the hum. Other times, when switching the ICs the hum shows up in the opposite channel but is greatly diminished. Also, I can sometimes amplify or diminish the hum by disconnecting the TV cable,

Thorman: I did substitute other IC cables to no avail but a good thought.

Hifimaniac: I just rearranged all of my cables, cords, etc. A couple of days ago but will double check for that. I thought it was fixed when I removed a "silent" exhaust fan that was close to the I/C input of the processor but after several days of perfect performance the hum just showed up again. AGGGHHH!

Thanks to each of you, I will continue the quest.
More to discover