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 tu
nt: Thursday, September 14, 2006 2:00 PM
> To: amradio@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
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
On 9/13/06, Don Merz <[EMAIL PROTECTED]> wrote:
It might end up being what I make it. I don't have any
Amperex tubes that fit this descriptiuon and no 806's.
I do have 250ths and it probably would not be a crime
to go to a clip on the grid instead of a cap. Or I
could work with the 810 which I ha
Yes, I will check the fil voltage as soon as I have
time. There is no bias supply. But both decks have
large tapped resistors on them that were probably used
for bias and perhaps other voltages. You're right
about the 806--that would be a possibility--I hope not
though because I don't have any.
73
On 9/13/06, Brett gazdzinski <[EMAIL PROTECTED]> wrote:
Tubes like the 75th and 100th sometimes had caps
on the grid, the modulators in my 30k1 had caps
for the grids.
I suspect they were supposed to have caps but they
were 'extra' from eimac?
You could buy adapters that slipped over the pins
e-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of A.R.S. - W5AMI
> Sent: Wednesday, September 13, 2006 1:16 PM
> To: Discussion of AM Radio in the Amateur Service
> Cc: Glowbugs
> Subject: [AMRadio] Re: Need ID Help for 1930's Transmitter
>
> On 9
On 9/13/06, A.R.S. - W5AMI <[EMAIL PROTECTED]> wrote:
Don,
GE also made some Eimac like triodes such as the GE806 which
was a close cousin to the 250T only it had .5" caps on the grid and
plate. Of course there are other possibilities like Taylor, etc.
Correction; the 806 was made by RC
On 9/12/06, Don Merz <[EMAIL PROTECTED]> wrote:
The final deck has a socket for a single tube with the
large, twist-lock base and 2 plate-cap-size
connections for plate and grid caps. Not many tubes
fit that description, so I am thinking maybe an 810
goes there? The Eimac tubes are out because th
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