The 4CX250 had a version which was conduction cooled. Matter of fact, there was
a two tuber in the ARRL handbooks back in the 80's. I don't know if it's still
in there or not in the new ones.
Best,
Will
*********** REPLY SEPARATOR ***********
On 11/3/05 at 10:49 AM David C. Hallam wrote:
>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@contesting.com [mailto:amps-bounces@contesting.com]On
>Behalf Of Bill Turner
>Sent: Thursday, November 03, 2005 10:33 AM
>To: amps@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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