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  #1  
Old 01-28-2008, 12:51 PM
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RCA TM-21B Color Monitor

anyone knowing of these were used in most early color tv stations?? The tube count is high, complicated set. Used very good color demodulaion and other advanced circuits? Henry kloss used one of these when he was designing the advent videobeam. It shows his lab setup with this monitor, screen size is adjusted to look like a rectangular picture, but screen is definate roundie and cabinet the same. Station indicator is projected in large white numbers w/ black background from square window above crt. Does anyone have one besides the museum?? Color reproduction must be excellent. For ultra accurate NTSC color?
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Old 01-28-2008, 01:29 PM
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There are 5 surviving TM-21s that we know of, 4 with collectors and one at the Early Television Museum.
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Old 01-28-2008, 01:39 PM
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Good to hear you chime in, That saba projection unit is coool. I wish more american sets were beautiful like that. Here's pic of kloss in lab while using monitor round screen
size shortened top and bottom probaly to mimic 4:3 for videobeam screen validating with henry kloss at the controls. Person working at advent said theses were for accurate NTSC referencing. Click on green arrows to see pic enlarged when popped up.
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File Type: jpg kloss lab.jpg (92.2 KB, 176 views)
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Old 01-28-2008, 05:02 PM
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The number above the screen was a piece of plastic to indicate the source (camera number), as this was a studio monitor with baseband composite input (no tuner). The "underscan" operation shown in the picture was selectable with a switch to show the complete image without corner cutoff. Part of the complication of studio monitors was to maintain linearity and convergence when in both underscan and "normal" modes.
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Old 02-05-2008, 10:22 PM
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I have an RCA TM-21 monitor. I don't know if it is registered with the archives yet-thought I have done that. I may get it fired up when the weather breaks. I have a GE PE350 camera sitting on top of it. Geeze it weighs a ton along with everything else I have! Julian
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Old 02-05-2008, 10:26 PM
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No, Julian, I didn't have your TM-21 in the database. I'll add it. Is it A, B, C, or D?
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Old 02-07-2008, 02:23 AM
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Julian, which cRT does you monitor have in it? 21AXP22, 21CYP22 or other?
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Old 03-18-2008, 06:17 PM
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You must be kidding?? I had one of those beasts when I went to high school.

Maybe I should have kept it. It's very possible that my monitor ended up in the hands of a collector. How interesting..... and it was CLEAN, too.

Well, you can't keep everything.
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Old 03-18-2008, 06:54 PM
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I'm thinking my TM 21 has a 21FJP22 in it. I also believe it was replaced in 1978 because of the warranty sticker on it. It is in my warehouse and will try to remember to look at it again and see which series it is and double check the numbers. It's a nice one and all complete with a beautiful front door.
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Old 03-19-2008, 12:32 PM
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There were 3 of those several years ago at Apex in Sun Valley... They were rusty and beat-up, but maybe I'll go see if they're still there. Next to them was a complete RCA film chain from the late 50s or early 60s.

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Old 03-19-2008, 07:29 PM
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Do I remember right that RCA only put the best of the best production CRT's in these? I wonder how they culled them.

Dave A
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Old 03-19-2008, 11:47 PM
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There is a 21 inch color CRT in Dave Johnson's stuff that looks just like a 21AXP22. It is labeled 1819P22. I was told that it was a specially selected 21AXP22 for use in monitors. Does anyone know if this is true?
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Old 03-20-2008, 11:36 AM
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the setup chart for the B&K tester
http://bkprecision.com/download/docu...on/100-CRT.pdf
shows the same settings for both
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Old 03-20-2008, 11:45 AM
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When I did transfers on the film chain at Compact Video in Burbank, CA in the early 70's, they used a roundie monitor. I asked and was told that it was a specially selected, optimal picture tube. The date would seem late for a 21AXP22, however, the practice would suggest that it would have been part of monitor manufacture.
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Old 03-20-2008, 12:54 PM
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Later, there were hi-res (supposedly) versions of the 21FJP22... I have one in my Zenith, which if I recall, is a HR21GVP22. I've heard of a military number for 21" roundie tubes, which might be this 1819P22... I wonder if SgtRob might be able to ring in on this?

Charles
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