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Re: [Amps] LK-500 ZA heat

Subject: Re: [Amps] LK-500 ZA heat
From: "Pat Barthelow" <>
Date: Tue, 14 Aug 2007 10:53:12 -0700
List-post: <>
For 3-500Z tubes that are cooled by a sideways air stream as in the SB 220, 
has anyone measured the temperature of the glass on opposite sides of the 
tube, to see if the upstream side is significantly cooler than the opposite 
side, which hopefully catches a lot of air that clings to and follows the 
contour of the glass envelope.   And if there were temp differences, is that 
an issue?   Or does the glass handle temperature gradients well, the only  
concern being the glass to electrode interfaces?

I remember similar verbiage describing the only upper limit to air flow 
being that which migh t  remove the tube from the socket, both in the Eimac 
Amateur Service Notes, and I think, in the Eimac Care and Feeding of Power 

I dug out my complete collection of Eimac Service Notes, about Amps, Tubes, 
and Even EME.   The complete set.  Someone suggested that those may be 
collectible.   I am not looking to sell t hem, but  would there be a need to 
make all of them available on the web?
Maybe they already are posted....
Sincerely, Pat Barthelow
Jamesburg Earth Station  Moon Bounce Team

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