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Re: [Amps] 4-250a mounting

To:, James Horne <>,
Subject: Re: [Amps] 4-250a mounting
From: Bob Sullivan <>
Date: Sun, 25 Dec 2005 18:38:54 -0500
List-post: <>

According to "Single Sideband" by Eitel-McCullough, 1955, which contains 
the Eimac spec sheets; for the 4-250A: "Mounting Position: Vertical, base 
up or down." Elements might "sag" a bit if off vertical - I wouldn't do it.

73, Bob
Personal site:

At 03:27 PM 12/25/2005, Peter Chadwick wrote:
>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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