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Last year there were at least two 21FBP CRTs for sale at the ETF so chances of finding one are good. Nick (AKA miniman) told me when I bought my set from him that on another CTC-4 he has for a time he had a glass tube in it and there was a scope HV lead that either worked straight up or at least had the correct plug to plug into the HV cage. I took the lazy path and used a salvaged BPC TV HV wire and carefully stripped a long section on the end of the wire, folded and soldered it until it would mesh with the female HV connector on the HV cage. and I sandwiched some thick plastic bags between the yoke and the HV connection on the CRT and the yoke.
It ain't the prettiest metal to glass CRT conversion, but it DOES work just fine.
You can do the metal to glass CRT conversion. Others have made it work in the past so there is no reason that you can't.
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