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Re: [Amps] Thoriated tungsten lifetime when idling tspa

To: Tom W8JI <w8ji@w8ji.com>, amps@contesting.com,"John T. M. Lyles" <jtml@lanl.gov>
Subject: Re: [Amps] Thoriated tungsten lifetime when idling tspa
From: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Reply-to: g3rzp@g3rzp.wanadoo.co.uk
Date: Sun, 11 Feb 2007 13:26:41 +0100 (CET)
List-post: <mailto:amps@contesting.com>
Tom said:
>They say twice for most tubes we deal with. The exact text 
says limiting current to two times the operating value helps 
reduce damage (movement) from repeated filament thermal 
cycles.<
But we all know that filament movement is caused by VHF parasitics, don't we? 
-:)

73
Peter G3RZP
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