RCA 21CT55 B8802897 is Alive!

[Tomcomm]

Seems I need to reiterate a few items that continue to provoke Member comment.
#1 Why do I insist on running the new FBX and the old CRT at “extreme” ultor voltages? Well RCA and GE 21FBP22 spec sheets specify max operation at 27.5KV. This level is undoubtedly driven by fussy Government X-ray mandate. The specs also notes: “Brilliance and definition decrease with decreasing ultor voltage.” Enough said?
Since brilliance and definition increase is what I’m after why shouldn’t I run at 30Kv (109%max) on a new “modern” FBX that requires only 200ma HOT current, at a winding temp of only 112degF! This new FBX is like a brick compared to the fragile original CTC2B FBX that ran 28KV at 264ma HOT.
#2 miniman has stated that I could ”find improvements in picture quality by providing a better signal to the CRT, like gutting the decoder entirely and going with something more modern”. Apparently he has missed the point of my entire effort to demonstrate the superior picture quality of the original full BW I/Q demodulation and low level matrixing of the CTC2B chassis. Was he serious or just being facetious ?
#3 My CTC2B is not in a cabinet in the living room or bedroom used as a daily watcher. It will always reside in the garage lab and most often not operating when I’m not there. If I’m “experimenting” with it, it will be fully instrumented as I described. Besides I have two spare, exactly the same FBXs in new RCA OEM boxes in a safe place in case of a highly unlikely FBX meltdown.
#4 My grey screen 21FBP22 may not be a 21FBP22 after all. Has any member ever seen a light grey screened FB, most are olive green? Bought mine from a rebuilder for $45 who said it was an FB but it doesn’t have any markings on neck or bulb. Doesn’t all CRT rebuilds have an obvious glass weld on its neck, mine doesn’t? On close screen inspection with mag-glass there are 3dot clusters of identical light grey with single darker grey or black dots between the 3dot clusters. Could my CRT be a replacement 21GUP22 or a 21GVP22? Electronic M posted a full screen color bar off his Silvertone that looked identical to one pic I took off mine, it looked great! He stated someone at ETF said it was a 21GUP22. How about it Tom, does your 21GUP22 have a light grey non-energized screen? Please reply...Tom