[Amps] Y-621B tube questions...

[Alek Petkovic]

G'day David,

It sounds like one of those little planar triodes.

Have a look at the Eimac Quick Reference Catalog. The 8940, 8941 and 8942 
may be similar.

I have a couple of Y-670A tubes which are not listed by Eimac. When I asked 
for specs, they sent me a copy of the 8942 specs.

They are also similar. They were used in a 420MHz pulse amplifier as a 
driver for a 8932 final. Other variants of these amps used a single 
3CX400U7 coaxial triode as the driver.

If anybody wants my two tubes, they are welcome. I'll even throw in the 
complete amplifier/cavity assembly tuned to 430MHz.  Digital pics available.
It is available for the cost of shipping. $30 would cover it I'm sure.


At 01:27 PM 7/11/2003 -0700, David McGinnis wrote:
>I recently aquired an amplifier that uses two Y-621B triodes.  Its a old
>Harris, military HF amp.
>
>Problem is one of the tubes is missing.  Other is unknown condition.
>
>Seccond problem is I cannot find a datasheet anywhere on the Y-621B
>tube.  Eimac made it, and a call to them tells me it is discontinued.
>
>What I know is the Y-621B is a conduction cooled Triode.  The amp runs
>two of them in ground grid.  Its rated as a 400 Watt amp.
>
>I've received information this tube is the same as a 8873, except for
>different filament voltages.  I do not know this for sure.  I understand
>the 8873 was in the old Heathkit 230 amp, and is also difficult to find
>(but at least is not as obscure as the Y-621B.
>
>Becasue of the compactness of the interior of this amp, switching to a
>forced air tube may not be possible.. what would be even harder is a
>tube that is larger.
>
>Does anybody have any specifications for the Y-621B tube, and can anyone
>confirm its similarity to the 8873 (and other 3CX400) tubes.
>
>Dave
>N7MJW
>
>
>David McGinnis
>Senior Deputy Sheriff,
>Missoula County Sheriff's Department.
>Communications Systems Coordinator,
>Missoula County Department of Emergency Services.
>
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>Missoula, Montana 59825
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