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.
Personal site: http://www.isquare.com/personal_pages/ras-hardware.htm
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!
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