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My CTC-10C had a 21CYP22 that was broken when I got it in 1975. I had a used 21FBP22 at that time, and not knowing anything, installed it in my set. It worked just fine. I re-replaced that tube in 1983 with an all-new 21FBP22. The only thing I had to do was remove the resistor from the HV connection.
It's turned on right now. It looks fine.
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