I have, what I think is good, a 21FP4 which is an electrostatic focus tube. Looks the same with the cylindrical faceplate. It's a rebuilt and I don't think it has many hours of use. I have to check it first and see if it's worthwhile.
All you have to do is remove the PM focus unit.
The CRT checks out perfectly!
I'll PM you soon with the cost of the tube and the shipping.
03-21-2021, 08:19 PM
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