[Boatanchors] Smart People: Gassy Tubes Reversable?

David Stinson arc5 at ix.netcom.com
Tue Dec 3 08:18:56 EST 2013


----- Original Message ----- 
From: "Jim Wilhite" <w5jo at brightok.net>

> What are the symptoms you are seeing in those tubes?

Been doing some work with master oscillators.
When used in a oscillator stage, gassy tubes "wander around"
once they heat-up.  The more gas, the more they wander.
I've had several tubes that show no gas response at all
on a TV-7 but when installed in-circuit, they "take a walk."
I believe it's gas because I have a couple of tubes 
with visible "blue glow" that show one extreme of the effect
and non-gassy tubes that show the other extreme.

73 DE Dave AB5S




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