Ummm, you guys are beeing very selective in the spec reading department.
For AB1 the max is 800 and typical is 750. For AB2 the max is still 800 but
the typical is 500 since the tube is being run harder; 800V would likely
exceed the anode dissipation with full drive and loading.
OTOH, for Class C AM its 600/500.
But what do hams care about ratings....run then until the anodes get a hole
in them.
Carl
KM1H
----- Original Message -----
From: "Ron Youvan" <ka4inm@tampabay.rr.com>
To: "amps" <amps@contesting.com>
Sent: Thursday, March 31, 2011 3:41 PM
Subject: Re: [Amps] 4-400A low output, VU3RAZ problem
> Mark K5AM wrote:
>
>>> VU3RAZ wrote:
>>> 4-400 (4-400A?) . . . 450 V DC Screen . . . 130 W output.
>
>> Your screen voltage is insufficient. Do you have the
>> data sheet, with specifications for class AB1?
>
>> I use 810 volts on the screens and get 1200 W
>> from two tubes in push-pull.
>
> My Eimac data sheet (4-400A) says 600 Volts is the absolute
> maximum screen Voltage and typical operation is 500 Volts so 450 Volts
> should work.
> --
> Ron KA4INM - Endless Loop: n. see Loop, Endless.
> Loop, Endless: n. see Endless Loop.
> -- Random Shack Data Processing Dictionary
>
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