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

Brett gazdzinski brett.gazdzinski at verizonbusiness.com
Thu Sep 14 14:11:47 EDT 2006

I think there was someone making the caps, listed in the
back of electric radio?

I wanted to get some for my P-P-P 100TH mod deck but never
got around to it.


> -----Original Message-----
> From: amradio-bounces at mailman.qth.net 
> [mailto:amradio-bounces at mailman.qth.net] On Behalf Of Donald Chester
> Sent: Thursday, September 14, 2006 2:00 PM
> To: amradio at mailman.qth.net
> Subject: [AMRadio] Re: Need ID Help for 1930's Transmitter
> 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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