This should be fun (RCA TM-10 15GP22 monitor)

[jr_tech]

And the gun was either assembled "rodded" or wired 9 weeks earlier (5-13).
jr

[Sandy G]

Don't really matter when it was made, its STILL Kewl as all H3ll, one of the best scores I've heard of since the "Prototype" set... This is almost as good as findin' a 1903 Ford Model "A"....Yes, they DID make Model "As" B4 1927...Henry couldn't bring himself to follow up Model T w/a Model "U" or "V", so he started over...

[Pete Deksnis]

Originally Posted by Phil Nelson

So, the date code is something like year-week (5-22 being 1955, 22nd week)?

That is so -- for RCA in the fifties. What ticks me off is when, in the next decade, RCA went to letter date codes for their 7- and 9-pin tubes.

As some of you know, I am slowly working on a 1956 Philco model 22D5102 color set with the TV-233 chassis. In the set, a Philco-branded, SYLVANIA-built 6AW8A date code -- for the 30th week of 1958 -- is "58 30", with the 58 stamped above the 30. However, a PHILCO-built 6M3 damper in the same set is stamped "249". I speculate based upon the history of the TV-123 in question that it stands for the 49th week of 1962.

Pete

[Phil Nelson]

Working at my usual snail's pace, I have gotten as far as easing the monitor onto its (protected!) face, so's to remove the CRT and get a peek at the nether bits. Looks pretty clean and unmolested underneath. I like that orderly layout.

After counting electrolytics (46) in the parts list, I decided to make a spreadsheet for ordering parts and keeping track of things that I replace.

Phil Nelson

[DanB77449]

I have an RCA TM-21 that was purchased from NBC in New York about 30 years ago. It was FULLY restored to PERFECT working order by Herman Reynolds III and Bill Cushman in 1987. The only problem with it is that the anti-glare glass that attaches to the picture tube has started to separate.

[DanB77449]

I have an RCA TM-21 that was purchased from NBC in New York about 30 years ago. It was FULLY restored to PERFECT working order by Herman Reynolds III and Bill Cushman in 1987. The only problem with it is that the anti-glare glass that attaches to the picture tube has started to separate.

[Penthode]

What an awesome project! I am sure you will have fun with this one, Phil.

Does it have RGB inputs? If so, it should provide a superior picture if sourced from Y, Cb, Cr.

[Phil Nelson]

Wouldn't that be fun? I don't see any inputs like that, though. On the first page of this thread is a photo of the back panel, showing jacks labeled R, G, and B, but they are identified as test points in the manual. Likewise, there are test points for I and Q.

I told myself I couldn't start on this guy until I cleaned up some of the long-delayed and half-finished projects I've had sitting around for as long as 13 years. Only one more to go, and then I can get busy on this.

I have assembled a complete set of good tubes for it and I have a sackful of new caps ready to install.

Phil Nelson
Phil's Old Radios
http://antiqueradio.org/index.html

[ChrisW6ATV]

Originally Posted by DanB77449

I have an RCA TM-21 that was purchased from NBC in New York about 30 years ago. It was FULLY restored to PERFECT working order by Herman Reynolds III and Bill Cushman in 1987. The only problem with it is that the anti-glare glass that attaches to the picture tube has started to separate.

Dan-

Welcome to Videokarma.

That sounds like a nice monitor. The picture tube (CRT) problem is commonly called a "cataract", and it can be fixed by a couple of different methods. One big discussion here on VK can be found by searching for the word "cateract" (notice the mis-spelling).

If you want to discuss your monitor more here on Videokarma, it would be best to start a new topic, and copy your notes above into that new topic.

[Telecolor 3007]

How old is this monitor?
Gush, it "swallowed" "only" 450 Watts!!!

[miniman82]

The consumer version (CT-100) was 475 watts...

[RCAGuy]

I'm counting on that CT-100 to help me reduce my heating bill in the wintertime, once I get mine operational. It will be a decent source of electrical heat.

[N2IXK]

Originally Posted by miniman82

The consumer version (CT-100) was 475 watts...

I guess the remaining 25 watts was the tuner, IF strip and audio?

[Phil Nelson]

Originally Posted by Telecolor 3007

How old is this monitor?
Gush, it "swallowed" "only" 450 Watts!!!

The CT-100 and this monitor use the same 15GP22 CRT, which was quickly superseded by bigger tubes, so I assume they were contemporaneous -- 1954 or soon after. A monitor could have remained in service for years, of course.

You might think they could simply strip the tuner, IF, and audio from a CT-100 and say, "Hey, I've got a monitor," but it's a little more complicated than that. This monitor uses 31 tubes vs. 37 in the CT-100. After I restore it, I'll write an article including block diagrams & schematic so people can compare.

Phil Nelson
Phil's Old Radios
http://antiqueradio.org/index.html

[miniman82]

The monitor probably uses different tubes, since some of the features of the CT-100 would not be needed. Does it have sound at all, or is this thing strictly video?