Well dodgy!

[poundy]

So I'm repairing nad 3020B (yes unusual I know 😉) but when I took the lid off someone has replaced the switch. But in doing so, permanently shorted out out the live feed, disconnected the FET muting and switched the neutral

 

[JonSnell Electronic]

Nice old school amplifiers.
Have fun with the biasing 👍

 

[poundy]

Don't find these to bad for the most part. Get the odd difficult old bird. Replaced the switch with new caps