[Amps] How much electrolitic for a HV supply ?

[Hamilton Horta - PY2NI]

    Hi everybody, is there any rule of thumb or whatever to determine the
minimum
amount of electrolitic caps should one put in a HV power supply?
    I am building a VHF PA with 1x GI-7B @ 2200V and another for a friend of
mine with 2xGI-7B, I know that we are usually biased to use as much as
possible but I am really eager to know the minimum for these two amps
running 1xGI-7B and one with 2xGI-7B both operating at 2200V.

Thanks a lot.

PY2NI
Horta