The 250TH looks very much like an 806, and as I recall, the filament
voltage is the same. It would be easy enough to fabricate pin adaptors if
you can't find some commercially made ones. Eimac made two versions of the
100T, 250T and 450T series, some of which had smaller (807 size) caps and
others, that had simple pins coming through the glass. In fact, some of the
new-in-the-box Eimac tubes I have seen with caps, used caps that were
attached over the pins with setscrews, and could be removed to accomodate
pin connectors as needed.
I think a 250TH would be much closer to the original than a graphite plate
bottle like the 810. Hovever, I prefer the bottle style of tube, since they
seem to be more durable. Of the 806/250T/H-K style tubes, I have found a
much higher percentage of duds, even with N.O.S. tubes, than with graphite
plate tubes.
Don k4kyv
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