Bill Fuqua wrote:
> Oh yes, about the photos, it looks like the glass envelope of
>tube on the left is scintillating due to electron bombardment. Nice red
>anodes as well.
>
>
It's very old - 1966 vintage - I think someone rode it hard and put it
away wet as with simple keydown ZSAC it glows brightly in that one
spot. The newer tube to the right is equal in its appearance all the
way around. I have the matching tube to the one on the right but when
it gets hot (long duration orange color) the connection appears to break
between the anode and the plate supply (not sure if this is possible) as
the plate goes back to gray color and the other tube picks up the load.
Not a good situation. So I put it on a shelf as an expensive ornament
and use the older one on the left. If I run the L4 at lower voltage the
plate never gets warm enough to cause this to happen but it's enough to
make me concerned against using it. I wish I could find another 3-400Z
to replace the one on the left.
73 Jason N1SU
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