2. amps-preamps
  3. 134113-6544

Audible Illusions Tube Pre-Amp Hum- Help Diagnosing

Began getting a low-level hum from the pre-amp which stays at the same low volume no matter where volume pots are set.  Both channels are affected, although it seems to have begun in one channel (or maybe it had been more noticable in one channel, or maybe it was my imagination.)

Is this a tube thing, a ground thing, or some other issue?  

Would like to narrow down possibilities before tearing apart the installation and/or buying tubes or other things unnecessarily. 

Thanks in advance for any guidance.
jimbo3

Showing 1 response by jimbo3

jimbo3 OP
304 posts
 
Thanks, Newbee. The one thing that is throwing my thinking off is that the hum (noise?) doesn't increase in volume, which is something I would otherwise expect to happen with a ground issue(?)  The problem seemed to have begun on one channel, though, so maybe a tube issue is still a possibility?  

I hadn't thought to disconnect sources one at a time as you suggested.  Will try that first.  
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