On Jul 21, 2006, at 10:58 AM, Tom W8JI wrote:
>> The way I see it, it's the same, as that connection is in
>> series with any anode fuse or glitch resistor. The way I
>> also see it, if a tube starts to arc, it's gassy and needs
>> to be replaced.
>
> That's absolutely incorrect for large power grid tubes!
Wow, and I used to think gas was a problem.
>
> Large power grid tubes often have noticeable seal leakage.
> It comes from the less than perfect bond between the leads
> and the envelope. A perfectly good tube that sits unused, in
> particular if it has been stored unused in a humid
> environment, can have seal leakage.
>
> Also elements inside the tube can outgas. The most common
> gettering material is zirconium. Zirconium is used on the
> outside of graphite or molybdenum anodes in 3-500Z and other
> tubes.
I don't see anything but graphite on the anodes of my Amperex 3-400Zs.
> ...
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R L MEASURES, AG6K. 805-386-3734
r@somis.org
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