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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