Thanks Larry,
So I got a Precision Apparatus 920 that looks really clean, all the papers, supplements books and tube adapters.
I popped the cover off and looked under neath before firing it uo and there are 2 wires off. Looks like one goes to the main tube and the other appears to go to the F position adjustment I can't figure it out from the basic schematic I found. ( But thinking I was doing the right thing, I did the DeOxit on everything, so off to Home depot for the CRC Electronics cleaner. Would anyone on this sight be able to ID where the disconnected wires go on this Tube tester? I have pictures and I think the schematic for it?
Thanks again for clearing up the DeOxit use, just happened on this.
What about on the sockets? Clean them also?
Ken