Hi Jerry,
I don't think there is proper electrical contact. The output from the speakers are weak.
Is the light turning on (on the Servo Controller)? I have had issues with other equipment where the PS is working but not providing all the power per specs. You could change the power port for a modern locking version. I suggest you post your concern on the FaceBook Vintage Infinity Group. Lots of knowledgeable people there. Some info: http://www.infinity-classics.de/technik/manuals/RS_IIA_technical_sheet.pdf https://www.davidsaudio.com/rs2a-b-manual.pdf
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