21FBP22 vs. 21CYP22 in RCA CTC-10C

[holmesuser01]

Sitting here this morning looking at my CTC-10C chassis while the morning crud is on TV. Something I've wondered for a long time:

When I got this set (no model stickers anywhere) the CYP22 was broken. I had a FBP22 which worked, and after a few years, replaced it with an all-new FBP tube. Should I consider trying to find a 21CYP22 to install next? Whats the advantage to using the original tube over this replacement? I still have the little resistor and clip for the 2nd anode connection in my junkbox. I dont throw anything away.

Your ideas and thoughts will help me go with a decision.

Bruce
Asheville, NC

PICS are coming. I just bought a digi-camera!