On Jun 26, 4:58*pm, "Richard Knoppow" wrote:
"BH" wrote in message

...
On Jun 25, 7:12 pm, wrote:

The following web page shows several photos of vacuum
tubes that glow
because they’re either gassy or induce florescence in the
their glass
bulbs. Although the English is a little choppy, the
narrative and
pictures are informative:

http://www.jacmusic.com/html/article...w/blueglow.htm

The author claims he’s revived gassy tubes by re-heating
the getters.
Has anyone tried this?

-Dave Drumheller, K3WQ

Sounds like hog wash. No blue or blue in tubes is probably
normal.
Magenta is probably gas.

* * *Its very common to see a blue glow on the envelope when
there is fairly high voltage on the tube. I've forgotten the
mechanism but its not gas. Gas can cause a glow between
elements.
* * *AFAIK, there is no way to re-flash the getter.

--
---
Richard Knoppow
Los Angeles, CA, USA




Usually take as the tube has gone soft , slight air leak over the
years ? soft vlave = soft vac , slight residual gas .. so assume
'gone' soft taken as loss of vac ?.. or may be impurity's in the
metal have boiled out due to over heating ?

G ..