Adcom GFA 555 II speaker buzz when RCA's connected

[DaveFred]

Problem with my GFA-555II's.

When amp is turned on with speaker connected and nothing else connected to the amplifier, speaker output from amp is pretty quiet.


Connect an RCA cable, either Blue Jeans or Amazon, then connected to a Parasound P6 or Adcom GFP-710 preamp or nothing, speaker has quite a hum. Simply plugging anything into the amplifier input causes the amplifier output to make a buzz/hum in the speaker.

Any ideas?

(yes, I am using two in bridged mode)

Thank you,

David.

 

[Michael Bean]

Was it initially OK and then went bad, or bad from the get-go?

Mike