I had used four caps rated at 450 volts/100 uF. They were in two pairs
series parallel for 100 uF/900 volts. Some hams cautioned me against using
so much capacitance. So I removed one pair of the caps and ended with 50
uF at 900 volts. The plate supply remained over 950 Volts until I keyed
the transmitter when it dropped below 900 volts as might be expected.
There is actually very little difference in HV PS voltage between tubes and
solid state when the supply is choke input.
High vacuum rectifiers have about 10-40 volts anode-cathode potential, so
there isn't much voltage to be gained.
Is this still choke input, and do you have adequate bleeder current?
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