I tested both caps with a modern LCR meter and a vintage bridge.
Both measure good for capacitance, but the smaller cap used in the focus circuit shows some leakage with only few 100 volts on it.
Should be a dual 0.05uF rated for 2kV or better
I'll attempt to open it up and restuff with a couple high quality plastic film types.
I also received a comment on YT that the focus cap failed and took out the focus HV transformer in the RR-359 at the ETF museum!
I'll be at the museum for the convention in a couple months and will thoroughly examine and document their set.
