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[Amps] Filament/heater life

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Subject: [Amps] Filament/heater life
From: Peter.Chadwick@zarlink.com (Peter Chadwick)
Date: Tue, 2 Apr 2002 16:05:19 +0100
Has anyone any hard information (as opposed to rumour, surmise, etc) as to
whether or not running heaters/ filaments of bigger tubes (60 watts or more of
heater/filament power) on DC has a deleterious effect on life?

Metal migration is obviously a factor that comes to mind, which of course,
doesn't happen with ac.

73

Peter G3RZP



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