-----Original Message-----
From: John Lyles <jtml@lanl.gov>
To: amps@contesting.com <amps@contesting.com>
To: <amps@contesting.com>
Date: 21 June 2001 13:25
Subject: [AMPS] filament cutback
>
>In nearly every gridded tube we use, we practice filament voltage
>cutback to improve lifetime. I have to contradict the advice that
>only nonlinear class C FM amplifiers with overkill tubes should do
>this. In all but one case, I am talking about Thoriated Tungsten
>tubes rated from 500 W to 250 kW dissipation, but they are also used
>in linear class AB 1 or 2 service. BUT I am not dealing with
>communications, where 2 tone IMD and such is a problem.
Presumably, if there's enough emission for a given carrier level, there's
enough for the same pep.
Steve
--
FAQ on WWW: http://www.contesting.com/FAQ/amps
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
|