2. amps-preamps
  3. 127971-7487

Hum hum hum

I have connected my NOS PS Audio gca 250 to my PS audio pre. Disconnected all inputs and I get a distinct hum at high levels on one speaker with just the amp/preamp/speaker connection. . Swich the xlr cables and the hum goes to the other cable. I probably will never play at these levels, but I would like to trace and fix the hum. Any ideas? Thanks.
nimbus109

Showing 2 responses by nimbus109

nimbus109's avatar
nimbus109 OP
3 posts
 
When I switch xlr cables, the hum goes to the other speaker. I bought new xlr cables and same thing happens. 
nimbus109's avatar
nimbus109 OP
3 posts
 
Sorry I have not been clear. With nothing connected to the preamp, I merely switched the xlr cables at the preamp end. Should I have switched them at the amp end as well? What are shorting caps? I was getting hum on one channel when I had cd and turntable connected and turning up volume with nothing playing the hum would gradually increase at higher settings
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