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Re: [Amps] re: baking out tubes

To: "carl seyersdahl" <carlseye@tampabay.rr.com>,<Amps@contesting.com>
Subject: Re: [Amps] re: baking out tubes
From: Bill Fuqua <wlfuqu00@uky.edu>
Date: Sun, 24 Oct 2004 14:54:18 -0400
List-post: <mailto:amps@contesting.com>
If the tube has no getter baking out requires a high vacuum system. The gas has to go somewhere after being driven off the internal surfaces of the tube.
There is another process called conditioning where the tube operated at normal filament voltage and the plate current is kept low. The plate voltage is raised ( current limiting requried) to the point where a spark is produced. This spark evaporates the sharp the small sharp irregularity that that was the cause for the low break down voltage. The process is repeated until the desired plate voltage is reached. This is how they make some not pulse rated tubes into pulse rated tubes.


73
Bill wa4lav


At 01:39 PM 10/24/2004 -0400, carl seyersdahl wrote:
  After reading about this subject I"m wondering about the requirements to
"bake out" a tube. !! do you run it with full filament voltage or percentage
lower? how about plate voltage?? screen? do you let it run any plate
(anode)current ??  How do you know when it's safe to use at normal voltages
?  Another inquiring mind.!!!
   carl / kz5ca


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