Question for you knowledgeable folks. I bought an old tube tester that has an RCA-83 mercury rectifier tube inside it. Before powering the unit up i gave it a quick look over and found there is a bunch of black debris floating around inside the tube. I have two questions really,
Where did it come from, is it the plate coating flaking off?
Should the tube be replaced, or is this normal for these type of tubes?
Cheers,
Mark
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