Pi-L Output Network Calculator

[Opcom]

Not much has been said about the voltage ratings. I always think 2X is right, but I've had arcs during 'mistakes'.

If the plate voltage is 1000 and the DC is blocked as it should be, what should the rating be on the input capacitor for maximum reliability?

What happens to the peak voltage when there is very light loading or when the load is forgotten as might rarely happen?

Does it become many times the plate voltage? (thinking of how resonance can really amplify a voltage, and about the flyback circuit in a TV where B+ is 400V and the plate pulse is 5KV)

Does it make sense to use a spark gap across the tuning capacitor for protection when higher plate voltages like 3000V-5000V are used? In one transmitter the B+ is 7KV peak with modulation and a 20KV cap is in use. For an upcoming project I have a 7500V cap, but the B+ will be 4500V.

Better to ask than start ruining vacuum capacitors.