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We are fortunate to have someone like Don to correct our sometimes inaccurate advice. He's absolutely correct.
I didn't realize how much of an oddball these are, especially the 21FP4, until I looked up more detailed data-sheets.
On the other hand, if you asked about the 21FP4 because you already have one you might be able to use it to see if you have the set working while you search for a 21YP4.
My statement about a deflection angle of 65 degrees wasn't quite correct either. That is the horizontal deflection angle. The diagonal deflection angle is 70 degrees for both CRTs.
John
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