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...
Efficiency and grid current are both high - suggests it's saturating
hard so you could just try loading it heavier. You'll lose some gain,
but should get more output if you crank up the drive.
Steve
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|