[Amps] Meaning of "conduction cooled"

[David C. Hallam]

The term conduction cooled refers to a series of metal ceramic tubes that
were cooled by contact with a metal heat sink though a BeO ceramic block in
a manner analogous to the way solid state devices are cooled on a heat sink.

Radiation cooling is used ham amplifiers.  Many a pair 4-400A's were/are
radiation cooled.

73
David
KC2JD

-----Original Message-----
From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com]On
Behalf Of Bill Turner
Sent: Thursday, November 03, 2005 10:33 AM
To: amps at contesting.com
Subject: [Amps] Meaning of "conduction cooled"


I notice that some posters are using the term "conduction cooled"
lately and I'm curious what they mean by it. Aren't all amplifiers
"conduction cooled" one way or another? Heat is conducted away by
some means, whether directly by air or liquid or indirectly to a heat
sink which is in turn cooled by air or liquid.

I'm aware of "radiation cooling" too, but I doubt many high power
amplifiers use that.

Some clarification would be appreciated.

73, Bill W6WRT

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