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Subject: [Amps] Getters
From: "John Lyles" <>
Date: Wed, 14 Sep 2011 08:18:09 -0600
List-post: <">>
Good enough. I did have a 3-500Z switch tube in my 314R1 broadcast transmitter 
go bright yellow on the plate when the clamp diode was shorted across it. The 
plate overload saved it but for a moment it was quite bright. There was blue 
fluorescence on the glass. 
I suspect that the plate outgassed a little, as it was 'processed' higher 
temperature in situ than Eimac likely did. It survived this test OK!

> But this doesnt apply to the ham type tubes in service today. A 3-500 doesnt 
> outgas at a red color and I havent found any decrease in a hi-pot even after 
> an extended bright orange.
> Carl
> KM1H

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