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In Reply to: RE: Tube Blues Really out gassing posted by Mechans on December 16, 2015 at 18:39:09
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)
Follow Ups:
Many transmitting tubes also do this, even when new. I'm pretty sure it's residual oxygen, not out-gassing.
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