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In Reply to: RE: Tube Blues posted by cabelok on December 14, 2015 at 14:34:31
They're displaying outgassing (gas).
"I can't compete with the dead" (Buck W. 2010)
"It would take me forever. I don't think I have forever" (Byrd 2015)
Follow Ups:
Isn't that a lot of gas. He describes this blue glow as an ongoing phenomena. Wouldn't that much gas make the tube unusable. I always though the blue glow was a cloud of ionic and free electron clouds.
BUT
You may be right because the ionic particles would have to be very light to float around the plates. Hmpph
Trying to regurgitate what I've read....possibilities causes, if I understand things correctly (which there's a great possibility I'm not)......
The getter may not be able to absorb the gases already present in the tube. A weaker getter to begin with, or depleted due to use and heat, etc. There may be outgassing happening now. Outgasssing can be from the glass envelope or materials in the envelope. There's residual gas not taken out during the vacuum process. There may be stored gases being released by the getter due to excessive heat.
I'm sure a fellow Inmate could add to, deduct from, clarify or elaborate on these thoughts.
"I can't compete with the dead" (Buck W. 2010)
"It would take me forever. I don't think I have forever" (Byrd 2015)
Many transmitting tubes also do this, even when new. I'm pretty sure it's residual oxygen, not out-gassing.
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