Rob is exactly right. Tubes have failed even with regular use because they
were never periodically run hot enough.
A well-known case in point was a commercial broadcast transmitter with a
3-500Z driver tube, which never ran red. Those tubes were failing way
before they should have. The fix was to replace it with a 3-400Z, which DID
run red and gettered the gas as it seeped in. Problem solved.
On Nov 26, 2016 11:34 AM, "Rob Atkinson" <email@example.com> wrote:
> I disagree. The internal graphite anode tubes must have color to
> de-gas and stay gettered.
> > You don't need to see cherry red with those tubes,
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