[Amps] 4-400A low output, VU3RAZ problem

[Bill Coleman]

I don't know what class VU3RAZ is running the 4-400s, but AB1 max screen is 
800V /w 750V as 'typical'

73, Bill   N2BC

-----Original Message----- 
From: Ron Youvan
Sent: Thursday, March 31, 2011 3:41 PM
To: amps
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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