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  #16  
Old 03-20-2008, 01:05 PM
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Did they ever make ones with a finer dot pitch than the normal 21" CRT?
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  #17  
Old 03-20-2008, 01:39 PM
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I have an all-glass non-faceplate 21 incher out of a test jig which has a type # starting with 18__. I've been told the test tubes were factory seconds; maybe the 1800 series designation in general was used on commerical/industrial equipment.
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  #18  
Old 03-20-2008, 02:09 PM
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Quote:
Originally Posted by kx250rider View Post
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
Very interesting - I never heard of hi-res roundies. Can you put a magnifier on it and another tube and measure the difference?
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  #19  
Old 03-20-2008, 07:08 PM
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My TM-21D manual specs a 21FJP22 tube. As soon as I get three neighbor kids and a block and tackle to move mine from the corner it is in, I will look at the tube.

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  #20  
Old 04-08-2008, 10:18 AM
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Quote:
Originally Posted by andy View Post
Did they ever make ones with a finer dot pitch than the normal 21" CRT?
No.
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  #21  
Old 05-08-2017, 04:13 PM
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If anyone has a TM-21D and would like an original RCA manual for it (MI-40226-D) they are welcome to contact me. I have one I'd like to give to a good home.
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  #22  
Old 05-09-2017, 07:32 AM
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Tm21

I can use that book as I have two of these monitors and lost mine in the fire. Please contact me! Julian Burke 865 567 eight nine six zero.
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  #23  
Old 05-09-2017, 12:16 PM
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We had 3 of the 21" color monitors in our color remote unit at KTLA used as a control room for our color studio. This was in the 60's. Still used them after rectangular monitors came in to use. This allowed directors to make sure images weren't cut off on all the roundies still in use. Also many commercial producers would request an RCA color monitor on the studio floor to check the quality of the color image. This as opposed to the consumer sets w/modulators we normally used.

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  #24  
Old 05-10-2017, 11:53 AM
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That monitor was a very well designed monitor. We used one on a TRT1B RCA VTR, which we converted to a high band system. That TRT1B was wonderful with its heterodyne color system, for wonky color tapes. We owned the only High band TRT1b in the USA
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  #25  
Old 05-10-2017, 04:57 PM
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A 1957 advertisement.



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  #26  
Old 05-10-2017, 05:33 PM
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Does a schematic exist for this monitor? They mention stabilized circuits using feedback, and looking at chassis pictures on the ETF it is clear 6AS7/6080 power regulator tubes are employed (likely for B+ regulation)....I'd really like to see what they did in this set VS their consumer offerings to make it more stable.
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  #27  
Old 05-10-2017, 06:58 PM
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This should be readable. See link: https://visions4netjournal.com/2017/05/10/1661/




http://wp.me/p8dob6-qN
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Last edited by etype2; 05-10-2017 at 07:03 PM.
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