2. amps-preamps
  3. 163657-117913

Strange buzz issue!

Hello audio friends! I’ve got a weird problem. I have an old ARC D-100B power amp (love the sound of it) and bought an ARC LS9 pre amp to match it with. Nice enough. Connected the LS9. Buzz/hum from both speakers. Consistent (clearly audible from listening position) at all volume levels/sources on the LS9. Crap, the LS9 must be faulty, I thought. For fun I connected the LS9 to two other power amps (Yamaha and Vincent). Dead silent. I then connected an old Yamaha pre amp to my D-100B. Silence. Same place, same cables. So, neither the LS9 nor the D-100B are faulty, but together they, or one of them, cause a pretty loud buzz. I’m going mad here! Any ideas? Thanks! 
teppas

Showing 1 response by hshifi

hshifi
572 posts
 
Hello,
First,
 Are the amp and preamp on the same power strip. Try a cheep power strip so the outlets are not fully separated.Second, 
 Sometimes changing the tubes helps. On a preamp that does not cost a lot. Next would be the ones on the amp. That will hurt a little. Third, 
Is there something on the circuit causing the hum. A dimmer switch will do it. 

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