Hi All,
As a TV broadcast engineer we simply used standard off the shelf
picture tube HV wire in a conduit for the 30 kV klystrode HV (up to
10 amps on black picture) AND we used RG-214 for the return (which
was a bit above actual ground) also in conduit for the return. This
system has been in operation since 1992 with no ill effects.
There is nothing wrong with using RG-214 (not RG-214/U type i.e.
foam) for a ham power level HV supply for your external wiring up to
the 4 kV DC level. The shunt capacitance is low enough not to affect
audio high end and there is no safety issue.
As a sidebar don't use crimp connections - only good solder. Crimps
eventually start to arc with time.
Larry
W3LW
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