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Re: [Amps] Heat Dissapating 8877 HV Plate Caps

To: "Tom Rauch" <>, <>
Subject: Re: [Amps] Heat Dissapating 8877 HV Plate Caps
From: "Roger" <>
Date: Sun, 26 Aug 2007 02:11:31 -0400
List-post: <>
> . I don't recall seeing any of them with vertical plates
> anywheres.  >>
> I certainly remember vertical fins on 3-400 and 3-500 tubes
> with chimneys. While the cooling is more effective when fins
> line up with the airflow, a large enough dissipating cap
> with improperly aligned fins could and often does work just
> fine.

When I worked in the semiconductor industry our *low power* RF induction 
heating units used a pair of large glass triodes that were physically about 
the size of a 4-1000A. The radiators that attached to the plate caps on 
these were about an inch and a quarter in diameter and had vertical fins. 
There were no fans in these generators. The tubes were air cooled while the 
inductors were water cooled. The output was about 5 to 6 KW, link coupled to 
a load that varied widely in impedance. The next step up were 12 KW out and 
used a tube that set in a water jacket/socket rather than having the jacket 
being part of the tube.


Roger (K8RI) 

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