[Amps] QB4/1100 linear amp circuit

[Peter Frenning, OZ1PIF]

3000V on the plate will yield approx. 700W output in GG service with both 
screen and grid tied to ground, depending on frequency. If you need more 
gain you can lift the screen to 1-200V that will liven up the the tube 
considerably.

At 3000V it will draw about 400mA max, at 4000V some 600mA.

If it's an old tube which has been stored for a considerable number of years 
(very likely), please don't forget to condition the tube before drawing any 
significant power from it. (Filament only for at least 24hours, and then 
work up plate Voltage from a few hundred Volts to max over a day or two, 
biased to draw < 50mA. Let it run at max for another 24 hours before 
applying drive)

Vy 73 de OZ1PIF, Peter

**********  OZ1PIF **************
email: oz1pif(no-spam-filler)@privat.dk
http://home24.inet.tele.dk/oz1pif/
Ph. +45 4619 3239
Snailmail:
Peter Frenning
Ternevej 23
DK-4130 Viby Sj.
Denmark
***********************************
----- Original Message ----- 
From: "Owen Wesstrom" <owenwesstrom at hotmail.com>
To: <amps at contesting.com>
Sent: Wednesday, October 27, 2004 10:16 PM
Subject: [Amps] QB4/1100 linear amp circuit


>
> I am student at Bloomsburg Univ. in the United States. I am trying to 
> build an RF transmitter using a QB4/1100 vaccum tube. I am going to be 
> driving the Power Amp with a 100 W driver Circuit and with a plate voltage 
> over 3000 volts. We need as much output power as possible. We are trying 
> to acheive over 800W. If anybody has any information on this topic it will 
> be of much help
>
> Thank you in advance
>
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