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.
200 West Broadway
Missoula, Montana 59825
office: (406)829-4277
cellular: (406)531-0303
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