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Re: [Amps] Alpha 99 Exhaust vent temps

To: amp <>
Subject: Re: [Amps] Alpha 99 Exhaust vent temps
From: Ron W4BIN <>
Date: Fri, 19 Apr 2024 07:54:00 -0400
List-post: <>
  Hi  Warren NI5L:

Hello all. I was referred to this list by Glenn, AE0Q, for an answer to my
question about Alpha 99 exhaust temperatures. I am seeing about 155 to 160
degrees F when running RTTY with 4.5 second transmissions at 500 watts.
It doesn't really seem all that high to me but I would like to make sure I
am not cooking the tubes. Has anyone here looked at exhaust temps and
determined what a safe temperature range is? I am using an NIST traceable
thermometer about ½ inch above the vents in the case, so the temps are pretty

  In my experiences the tube manufacturers specify air flow as a measure of tube cooling.
You might want to invest in a air flow meter if you  are concerned.
I am sure many finned anode tubes operate at a fin temperatures exceeding 230.º F in
broadcast use.
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