Wow! It's interesting that you should mention this: the ones I
remember trying quickly started to look like there was some kind of
film coming off of the anodes (they certainly didn't start that way).
It looked *exactly* as you describe. We could never get those tubes
to behave and finally went back to the 3B28s. Any idea what it is/was?
Kim Elmore. N5OP
At 11:39 AM 4/27/2008, you wrote:
If there is visible black crud inside, that looks like the ashes of
burnt newspaper, the tube is probably NG. That stuff tends to peel
off the anode of tubes with many hours on them, and the tubes nearly
always arc over no matter what.
Don k4kyv
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