Fisher 880 Hum

[Brian Scott]

Recently picked up an 880, appears to be super clean and cared for but getting a hum when connecting RCA cable to the back of the unit to both the AUX and Tuner inputs. I have tried to isolate the ground on the plug as well as try out the "Ebtech Hum X - Plug-Style AC Voltage Ground Loop Hum Eliminator" which did not fix the problem. I have popped the top off, looking at all connections, caps look good (IMO), not bulging at the top.

Ideas on correcting this issue?

 

[cademan]

Is this a CA-880?

If not, still you might want to turn it over to expose the circuit board and see if there is a cold solder joint for the ground of the inputs.

Have you tried the tape input?

 

[Brian Scott]

I have not tried the tape input but I will. I will reopen the case again and look closer at the ground for the inputs again. Thank you for the help.

 

[Brian Scott]

Tried all of your suggestions and still have the dang hum. I even re-soldered the ground for the inputs just to be safe.