My CTC-10C set was necked when I got it in late 1974. It used the CYP22. Found a FBP22 tube in a junk carcass. I didn't have any way to test the tube, or any of the tubes in the chassis, for that matter.... I was around 18...
I was rewarded with a good color picture from this unknown CRT. The tube lived until 1984, when I bought a brand new FBP tube from an Atlanta dealer that found it in their warehouse... they thought it was a returned dud, until I opened the box.
I'm so glad I fixed that set. It has been a reliable performer with most of its original capacitors all these years.
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