[Amps] Grid vs cathode driven

[Peter Chadwick]

Hsu said:
>I think we can use similar design in RF amplifier, add a wide band HV RF transformer to change the push-pull output to single end output, so we can use same Pi network as same as single end 811A GG amplifier,even we can useing RF transformer reduce the output impedance, so we can use inexpensive low volt air capacitor(reciving caps).simple input net work, withou screen and grid PS, cheap out put Pi network,it seems very perfect amplifier!<
I would be very dubious about the practicality of making the transformer. You're looking for a wideband transformer from about 13k ohm or so down to whatever, and that means a lot of primary inductance, and thus capacity (because of the number of turns) You also need a lot of ferrite to avoid saturation. With a low impedance arrangement ( say a lot of sweep tubes) it becoems more practial because the impedance is lower.
73
Peter G3RZP