[AMRadio] Re: Need ID Help for 1930's Transmitter

Don Merz don at thedjbrothers.com
Thu Sep 14 17:01:06 EDT 2006

250TH would be my first choice...except that I already
have two homebrew rigs that use that tube in the
final--one single-ended and one push-pull. I'd  prefer
a little variety, so something I'm not already running
would be nice, though maybe not possible.

I do like the looks of the bottle-style tubes--203,
810, the Amperex versions--those are mean looking

73, Don Merz, N3RHT

--- Donald Chester <k4kyv at hotmail.com> wrote:

> 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
> This message was typed using the DVORAK keyboard
> layout.
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