Friends,
Recently I have worked on a friend's GS-35B two tube amp. I replaced
both tubes in it. During the testing after the tube swap I noticed that
by looking straight down through the anode cooler I could see a distinct
glow. Interestingly enough, one tube was glowing BLUE and the other tube
was glowing GREEN!
I recently completed building a tube tester to test the GS-35B
<http://tester.gs35b.com> and had used it to determine the condition of
the tubes we replaced in the amp above. Today I tested four more new
tubes specifically looking for that glow. I replaced the opaque chimney
with a Coleman lantern globe temporarily for these tests so I could see
the ceramic. The pictures I have posted on this page are the results:
<http://glow.gs35b.com>
I'd be interested in any pictures that any of you have taken or do take
of your tubes glowing like these; and, with your permission, to post
them on the page with the others.
We have already had some interesting discussions about how this glow is
created and the best explanation we have come up with so far is electron
bombardment of the ceramic causing trace elements to fluoresce. If any
of you have a better explanation (NOT that the tubes are gassy...
they're not) I would love to hear about it.
73, Tony W4ZT
http://gs35b.com
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