[Amps] Meaning of "conduction cooled"

[David C. Hallam]

Strictly speaking, glass envelope tubes are cooled by a combination of
radiation and convection with only a very slight amount of conduction
cooling.  The cooling of anode is by radiation and the envelope and seals
are cooled by convection with some radiation and a slight amount of heat is
carried away through the socket and chassis by conduction.

More than you ever really wanted to know about tube cooling.

-----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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