Measure/Adjust Idle current on Optonica SA-5105

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Thanks for the reply. Here's the schematic and a photo of the inside of the receiver. Amps are screwed to the left side of the heat sinks.

I probably shouldn't even be messing with this thing. I just bought it. It was new, in the box for 40 years, still in plastic with all the paperwork. It sounds great to me. But I'm curious, I'm 51,and I need something to fiddle with.
 

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