|[AMRadio] Free Mercury|
cw_de_n5op at sbcglobal.net
Sun Apr 27 14:30:54 EDT 2008
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.
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