From: "Tom Rauch (W8JI)" <W8JItom@worldnet.att.net>
Reply-To: w8jitom@worldnet.att.net
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To: amps@contesting.com, KC0EI@aol.com
Subject: Re: [AMPS] Care and Feeding of the 3CX800A7
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KC0EI@aol.com wrote:
> call and do not plan to chase any more DX. Should we just turn it off and go
> watch TV or keep it on for a period of time? Should we casually turn it on
> when we turn on the transceiver just in case we need it? I know that we
> should not just casually turn it on and off.
Hi Tom,
Seal tenmperature woulod be the only concern.
I've measured the temperature after shutting tubes off quickly, and
never found a case where seal temperature is exceeded by the heat-soak.
The worse case would be glass tubes, since the anode is internal. The
ANODE is the primary heat source and could be hotter than top seals. The
anode seal would be the only worry, because of heat conducted out the
anode support.
I would think a half minute or so of air flow after transmission would
be enough in any case with metal anode tubes, and longer with graphite
anodes (because they have much more thermal energy storage). With
ceramic external anode tubes, I wouldn't worry at all.
73 Tom
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