[Amps] Grounded Grid(Screen) 4CX250B power gain

[Fuqua, Bill L]

In the 60's a ham friend of mine was experimenting with different tubes in grounded grid configuration.
One experiment he did was four 4CX250Bs.
   He first tried both grids grounded and fried them before he got the output power he was looking for and
then tried a series resistor in the control grid of each tube to limit the current but I think it was on the order of 
a kOhm or so. Still did not get the results he was looking for and finally tried connecting the control grids to 
the cathodes. It worked but he had low gain and just did not have enough drive to get the same output power
that he could with the four tubes running with the cathodes grounded. 
  However, I suspect that if you did run the 4CX250Bs in G-G and had the control grid connected to the cathode
it would be quite linear. The cathode impedance would be a bit high but the reason I say this is that I think the
screen current would be very low. However. you would have to swing the cathodes to a peak negative voltage of
250 to 300 volts. I would like to find time to experiment with this and make distortion measurements but just don't 
have the time.

73
Bill wa4lav