Quote:
Originally Posted by Tomcomm
#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
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It is ironic that somebody would bring the set up only a few hours before it had a major breakdown.....
First off it's screen is not a light gray, but rather a dark gray that matches the mask. It almost looks like a modern dark face CRT with the safety glass on (it has been too long since I have removed the glass to remember the color, and I didn't snap a picture).
It is the (I believe) factory original CRT and is a type 21GUP22.
I believe that this is the color bar pic you mentioned.
I believe that it may have been Mark who said to me at the 2010 ETF meet when I got it that he thought it may be a black matrix type. Which is quite possible. I did some cateracting this summer and was able to compare a genuine black matrix rectangular delta-gun CRT to a regular type of the same size, so if I take the tube out of the Silvertone during trouble shooting (I have to readjust the mountings anyway so why not take it a step farther) I'll get a shot of the phosphor and try to determine if it is a black matrix type.
My set is a clone of an RCA CTC-15 or CTC-16 and lacks the benifit of an IQ demod scheme. I suspect that the alignment is lousy on mine. The colorimetry heretofore has been outstanding (ignoring that the screen adjustment balance tends to vary over the course of warmup and extended viewing), but the picture detail both color and mono can't hold a candle to my 71' Zenith Chromacolor hybrid (when the Zenith's focus and color circuits feel like warming up and doing their jobs that is).