[Amps] 3-500 / 4-400 cooling (09/10/2005)

[R.Measures]

Ian White GM3SEK wrote:

> The K2RIW system has one disadvantage: the base no longer receives the
> full air flow, directly onto the seals. Instead it only receives part 
> of
> the total air flow, going downward past the seals. For that reason,
> Eimac did not recommend the K2RIW system.
>
> But consider this: the later Eimac pin-based tubes such as the 8877 and
> the 3CX800 use a ceramic wafer socket that totally covers the base
> seals... so maybe it isn't quite the engineering no-no that we were led
> to believe.

As I recall, the E. F. Johnson socket for the 8877 has a center hole 
that passes air to the base.

Richard L. Measures, AG6K, 805.386.3734.  www.somis.org