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

[Carcia, Francis A HS]

You should have used the B&W 852 with lower inductance but 60 to 65 %
efficiency is good for a
Class AB linear. 

-----Original Message-----
From: Bruce Lanning [mailto:blanning at acadia.net] 
Sent: Tuesday, October 11, 2005 10:28 AM
To: amps at contesting.com
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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