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Re: [Amps] 4-250a mounting

To: James Horne <>,
Subject: Re: [Amps] 4-250a mounting
From: Peter Chadwick <>
Date: Sun, 25 Dec 2005 21:27:11 +0100 (CET)
List-post: <>
As I understand it, the filament structure is the same as the 3-500Z. Not sure 
about filament to grid spacing, but I have had some go grid to filament short 
when hot, and that's with them mounted vertically. Depending how many tubes you 
have, it could be worth trying. Rich Measures may have some historical 
knowledge of 3-500 failure modes which could be applicable. I think personally, 
I'd avoid it, but that's partially because I don't have a lot of spares!

Peter G3RZP
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