Denon PMA 860 loundess switch

Welcome to the forum!

I presume you have opened up the amplifier to see if you can access the rear of the switch?

Is there a possibility of spraying contact cleaner into the inner workings of the switch? (Thereafter operating the switch many times to clean the contacts).

The loudness switch (SW203) is listed on page 20 of the Service Manual:

https://www.audioservicemanuals.com...n-pma-860/212782-denon-pma-860-service-manual

You'd be unlikely to source a compatible replacement switch.
 

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