I think it´s a good idea to cool the base side.
I run a 3 tube 250B amp on 144 MHz with the tubes
mounted like that (old YU1AW design), however
I also circulate the air in the grid section, i e
the blower first feeds the grid section the air
comes up thru some holes to cool the anodes and
finaly escape thru teflone cimneys.
Not an answer to your question but still ........
73, Jim SM2EKM
----------------------------------------------------
>
> A friend asked me this the other day... and, since I don't know, I
> thought I'd ask the list.
>
> If a 4CX250 (or similar) tube is mounted with the screen ring
directly
> grounded by means of a flange (or perhaps finger stock) in a cavity,
and
> with the anode cooler provided the recommended air supply, then is
any
> additional cooling required on the base side, to keep the seal
> temperatures within specs?
>
> Or would conduction cooling from the screen ring to the chassis be
> sufficient?
>
> 73,
> Marv WC6W
>
>
>
>
>
>
>
> *
>
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