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[TCML] overheating diode strings

Hello Everyone,
I constructed eight strings of 50, 1000V, 10 A diodes. I assembled and tested four strings without equalizing capacitors and resistors and four strings with equalizing capacitors and resistors.The diodes came off eBay from a company in China. All diodes checked OK on my diode tester. These strings were then soldered into two full wave bridge rectifiers powered by a variac. My scope shows a 60Hz output on both which should be 120 hz output. The negative output string that connects to the wiper of the variac becomes too hot too touch at less than 5 volts output on both units. One of these when working properly will be supplied by an 8 Mot stack.
All help will be greatly appreciated.
Thanks, Jim
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