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heathkit tc3
Posted: Mon 02/08/21 6:22 pm
by geoff 1965
just servicing my heathkit tube checker new capacitors and kiwame precision resistors,came to check the rectifier diode and i'm getting same ac votage on both sides! so replacing it with a 3amp 1000V UF5408.just out of interest has anyone come across one of these old rectifiers? reference on the schematic is M1 and if you look at the pic it's between the red & yellow wires and looks like a stack of washers!
heathkit_tc3_tube_tester_sch.pdf_1.png
C988C11F-1568-423E-809B-FC52936A1E29.jpeg
here’s a closer pic
4D812FA2-D677-4EFE-B194-23B584335719.jpeg
Re: heathkit tc3
Posted: Tue 02/09/21 2:44 am
by TriodeLuvr
Not sure you should replace it. Here's a discussion about it...
https://antiqueradios.com/forums/viewto ... c883e510a4
Jack
Re: heathkit tc3
Posted: Tue 02/09/21 6:04 am
by geoff 1965
Thank's for the link Jack,yeah i swapped in a silicon diode and now the meter does’nt work! Those copper washers must form some resistance or something,i’ll put the original back.made the mistake of taking the symbol on the schematic as diode also the build manual only describes it as “meter rectifier” with no specs,lesson learned!