My CT-100 lost HV (from losing one B+ line).

[Electronic M]

Originally Posted by dtvmcdonald

I could try your idea with the CRT only unplugged (both ends),
except I'm afraid for the flyback.

There was a tube type (wish I could remember it's number...) that was essentially a 10BP4 gun and base firing into a metal anode that was sometimes used as an HV dummy load in early sets...The 6BK4 and the like were refinements on it IIRC...You could probably use one of those or a 6BK4 connected to the CRT base and HV circuits to sub for the load of the CRT.