2. amps-preamps
  3. 184310-3592

Krell KSA 200s ground hum

I picked up this amp a week ago and I REALLY like it. When I first plugged it in with nothing attached except speakers it was silent. Like small hiss from an inch away but one of the more silent pieces I have had. As soon as I hooked up an rca from my preamp there it was. Loud ground hum. So right now I have floated the ground with cheater plugs on everything in the chain. Silence all is good with the cheater plugs and the system sounds great. If I take the cheater plug off of any of the 5 pieces in the chain it’s back! All same outlet and dedicated 10 gage line. I mean I’m “ok” with the cheater plugs if need be but…….. any ideas? 

mofojo
erik_squires
15,805 posts
 

disconnect any incoming coaxials, like cable modem, satellite TV, etc.

Also, USB cables from a PC.  :)

mofojo OP
2,173 posts
 

I can have just one of my grounded components plugged into the dedicated line with the amp. Any of them. When I hook it up via rca to the amp the hum is pretty loud. Float the ground in that component and the hum is gone. 

erik_squires
15,805 posts
 

And the amp is NOT right physically under another piece of gear?

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