21CT55 Screen-Shot Test

[Tomcomm]

Point of interest: What does an unmodified 21CT55's CRT anode voltage run with cutoff screen and the HV regulator pulled, with 130V AC Line input? Anyone?

Seems this worse case scenario must have been envisioned by RCA engineers before they got it released to production. What sort of catastrophic failure of non-tube replaceable parts would they tolerate? The CRT and FBT for sure are
major items of concern and must be specified with at least 10% safety factor.

My 21FBP22A CRT is spec'd at 27000 volts max. My 21FBP22A CRT is set to run at 30000 volts with 120v AC or 11 percent over max spec for demonstrable maximum picture quality. I accept this risk vs performance tradeoff.