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It has the wired in board with one plug in relay and one of the square soldered in relays, although the square relay had no cover when I got the amp. Caps and diodes were just replaced but I guess there is a possibility one of them has gone out.

Installed the chokes and now for some reason the high voltage relay won't close when the amp is keyed. Ran out of time last night, will look at it again this weekend but caps and high voltage diodes are good.

Thanks Nomad, I'll give that a try. This amp has had many hands in it before I acquired it. The wires for the cap clip look to have been changed, they aren't bare. Red vinyl coated, no beads. I will install the chokes and make sure socket boards have proper ground and report back the results.

I know this thread is old but I have a problem with the same amp. When it gets warmed up, generally toward the end of tuning the relays begin to chatter and sometimes stay stuck chattering even after the mic is unkeyed. I have checked every component on the relay board with no luck. All the...