Bottlehead Forum

Bottlehead Kits => Legacy Kit Products => Stereomour => Topic started by: Downhome Upstate on April 20, 2013, 04:11:12 AM

Title: Likely source of hum (120 hz?) on one channel?
Post by: Downhome Upstate on April 20, 2013, 04:11:12 AM

With or w/o input applied & regardless of source selected, I've got hum on one channel  significantly louder than the other.  What are the likely culprits?

Title: Re: Likely source of hum (120 hz?) on one channel?
Post by: Grainger49 on April 20, 2013, 05:00:05 AM

Mike,

Did you short the inputs?  120 Hz should be from the power supply.  But it should be both channels if it is the power supply.  Maybe the power supply wires are routed such that they impress noise into the channel you have problems with.

Title: Re: Likely source of hum (120 hz?) on one channel?
Post by: Downhome Upstate on April 20, 2013, 05:26:54 AM

Thanks, Grainger. Nope, haven't used shorting plugs. I'll try moving the PS wiring around a bit. . .

Title: Re: Likely source of hum (120 hz?) on one channel?
Post by: Paul Joppa on April 20, 2013, 06:23:04 AM

You didn't mention having adjusted the hum pot - just sayin' ...

Title: Re: Likely source of hum (120 hz?) on one channel?
Post by: Downhome Upstate on April 20, 2013, 07:48:42 AM

Hi, Paul.  I did (adjust the hum pot, that is).  What I didn't do was pay attention before my first post. It's not the amp. It's the Seduction  :-\