Ian wrote: > Way out at the other extreme are the guys using two GU-84Bs in parallel, > at 3kV / 1.2A *each*! Their power supplies see an RL of only 1.25k, so > they're really struggling to find enough filter C to let them run 4k > out... the poor dears :-) I guess those people prefer to run a 3-phase power supply at 4% hum without capacitor, so will be very happy with 4µF 73 Peter