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Help - Adcom GFA-545 works in mono only

I just got my Adcom GFA- 545 amp from eBay, that's I'm using to power NS-10Ms for a studio solution and I noticed that the amp works in mono only, regardless of source panning.

Both RCA inputs are ok, I tried plugging only one and panning worked as expected - no sound when panned hard one side, normal sound when panned to the other, so there appears to be mono summing going on inside the amp.

The other thing I've noticed is that the right side of the amp runs significantly warmer than the left, which is barely emitting any heat.

Do you have any suggestions as to how to resolve this?
Thanks!
jacentys

Showing 3 responses by jacentys

jacentys OP
3 posts
 
Ok, thanks for the replies.

It's a little weird that the signal is coming out as mono from both sides, if one side would be dead.
Sounds more like somebody did a rewiring job or something... or is that a wrong assumption?
jacentys OP
3 posts
 
Thank you all for the help.

The seller has been great about it and I will be returning the amp.
jacentys OP
3 posts
 
I was looking in the manual and there is no mention of such switch.

If that is the case, then I'm guessing there was some manual rewiring going on but I'm not good enough with electronics to troubleshoot that.
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