[Amps] Low power output from 4-400A linear

Tue Oct 11 10:44:22 EDT 2005

In this configuration the gain will be quite low; expect 6-8dB.
You dont write how much power you feed it with from the exiter, but if it is 
100W you are in the ballpark.
I've buit a similar amp, using a QB4/1100 (7527), which yelds a max of some 
750W for 100W in with Plate at 3000V.
If you want more, up the plateV to 4KV, my guess is that that alone will 
bring it beyond 10dB and 1KW. If more gain is needed you can lift the screen 
to around 100V (make it adjustable, and you have a variable gain amplifier!)

Vy 73 de OZ1PIF, Peter

**********  OZ1PIF **************
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Ph. +45 4619 3239
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Peter Frenning
Ternevej 23
DK-4130 Viby Sj.
Denmark
***********************************

----- Original Message ----- 
From: "Bruce Lanning" <blanning at acadia.net>
To: <amps at contesting.com>
Sent: Tuesday, October 11, 2005 4:27 PM
Subject: [Amps] Low power output from 4-400A linear

> Several years ago, I built a GG amplifier using a pair of 4-400A. The grid
> and screen are grounded at the tube socket.
>
> I feel that the power out is quite low. Below are some of the operating
> parameters:
> Measured power out: 855 watts
> Power input: 1216 Watts
> Ep:3200 Volts
> Ip: 380 Ma.( at max output)
> Ig: 250 Ma.
> Eg: Bias 00
> Static Ip: 120 Ma.
>
> I am using the B&W Pi-network, model 850A output tuning inductor
> .
> I have checked the tube filament pins for a poor solder joint.
> They both looked OK, but I resoldered them to no avail.
>
> Maybe someone out there could throw some light on my problem, or if I even
> have a problem...
>
>
>
>
>
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> http://lists.contesting.com/mailman/listinfo/amps
>
>
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