[AMRadio] Free Mercury

[Kim Elmore]

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