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The D5 stuff is what you want to get to spray into these switches. Back in the day it was just Deoxit, then there was progold and faderlube all made by Caig labs. now it seems they call everything deoxit.

It looks like the coil voltage for that contactor is 28VDC so nevermind the 400Hz spec. With a component like that the most important info is the coil voltage and the current rating. The reason it says 400Hz on the side is most likely because a contactor that was rated for up to 400Hz was needed.

It looks like the CT is wound properly. Two wires going through each CT 4 times, looks like about 8 loops of wire on there.

If it does turn out just to be a dirty switch I think the deoxit will probably help. I have used all kinds of different contact cleaners found at automotive stores, and brands like techspray but the deoxit is probably one of the best out. That stuff has brought back many a piece of vintage audio...

I had a somewhat similar issue with my 803. The % current meter seemed accurate but it would trip the overload way too early. I thought perhaps a bad current transformer or overload circuitry. On the advice of members here I took the top off and cleaned the reconnection switch with about a full...