The problem is, DC damages / shortens the life of the tubes.
RP





  Peter, I'm not very sure you have right here. The circuit does not work
at resonance this is sure. A series resonance  (R-plasma, L-transformer
coil, C-series capacitor) which is current resonance will not help at all.
If would be a parallel resonance then yes, I would be agree. But is not.
The capacitors values are usualy 2x33pF/2KV. There are also usually two
bipolars as you say and one NMOS. I have doubts the DC created by tube
rectifying will bother the circuit. It's posible just to saturate the
coil as reversed supply ...? Changing the 33pF with 100pF does not
change too much the current through load. I think this is just a XC
limiter and nothing more. More than that, I've exeperiment with short
circuiting one of the capacitors (one stage, for one tube) and there was
no difference in current load comparing with the standard one. Also a
saturated coil becomes very quickly hot, but it wasn't hot there.

best regards,
Vasile

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