[Amps] Grid vs cathode driven

[Hsu]

Peter,
  I don't think so, the output impendence should so high,if I the voltage of plate=3kv, current=0.8A, the output inpendence should be 1500ohm.I just finshed the 8xGU-50's amplifier, it used a transformer(without ferrite ) like this ,anode volt=1kv,current=1.3A.
it works great now.
   73! Hsu  

I would be very dubious about the practicality of ma(full load), king 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