[Boatanchors] Smart People: Gassy Tubes Reversable?

[Al Klase]

Bry and Dave,

There are two distinctly different "blue-glow" pheonomena, a glow on the 
inside of the glass when operating the tube at high voltage, and a glow 
inside the plate structure.  The former is harmless, and some believe 
only happens if you have a really good vacuum.  It's the result of 
high-energy electrons bombarding the glass.  Like this:
http://notinteractive.com/stuff/guitar/october/blue-glow.jpg

The latter is a sure sign of a gassy tube, and cause all kinds of trouble.

Which are we talking abount.

Al

On 12/3/2013 8:27 AM, Bry Carling wrote:
> Dave
> The purple glow is quite common in some power tubes like 6V6 or 6L6 etc. They often seem to work fine otherwise.
>
> Bry Carling
> http://af4k.com
> Sent with my iPhone 6
>
>
>> On Dec 3, 2013, at 8:18 AM, "David Stinson" <arc5 at ix.netcom.com> wrote:
>>
>>
>> ----- 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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