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

[Scott Townley]

another thought...is there a tuned input/cathode circuit, or is it direct-feed?


At 07:27 2005-10-11, Bruce Lanning wrote:
>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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