No need to quibble about 50V days after the thread ended. More screen
voltage also means a higher potential for instability and a fried tube.
I used to run 750V since thats what a string of VR-150 tubes came up with.
Life was easy back then.
Carl
KM1H
----- Original Message -----
From: "John Finner" <finnerjf@att.net>
To: <amps@contesting.com>
Sent: Friday, April 01, 2011 10:57 AM
Subject: Re: [Amps] 4-400A low output, VU3RAZ problem
> Carl and others
>
>>From the Eimac mid 50's book "Single Sideband" page 13 there is a 4-400A
>>data sheet for class AB1 single sideband operation which lists DC Screen
>>Voltage 850 Max Volts.
>
> John WA4EPI
>
> **********************************************************
>
> 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
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