Re: [TCML] overheating diode strings

[Frank <fxrays@xxxxxxxxxx>]

Hi Jim,
A schematic would be nice but having the negative side of your bridge 
connected to the Variac does not sound right either. A Variac are an 
AC device only and it should be connected to the AC sides of the bridge.
One side of the AC  bridge to the variac outside and the wiper to the 
other side of the AC bridge conn.
Frank

At 04:00 PM 8/28/2014, you wrote:
> 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
> _______________________________________________
> Tesla mailing list
> Tesla@xxxxxxxxxx
> http://www.pupman.com/mailman/listinfo/tesla
_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxx
http://www.pupman.com/mailman/listinfo/tesla