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I was just going to say the same as Walter did. using a variac to confirm B+ in the right directions.
I one time goofed a top hat style silcon diode. I just grabbed one and put it in the same way as the one that came out. it was in a voltage doubler circuit, and turned out it was revesred from the orig diode. Up till then I did not realize that top hats came in two styles (reverse polarity). the variac saved me as I was getting some really strange readings the way it was done.
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