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#1
10-19-2002, 11:20 AM
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Thanks again
Rob,
Thanks again for being the conduit that allows me to share these pictures with others. The digital photos of my CT-100 were taken by Jon Lopez in Aug.2002. The Anchor person is off a CNN broadcast.The color bars are from the internet. The DuMont test pattern is off an internet site devoted to vintage test patterns. Dumont would broadcast experimental color slide pictures over both their regular New York VHF channel 5 as well as a UHF channel during normal off air hours in 1953 and early 1954. To the best of my knowledge DuMont never broadcast any commercial color telecasts. 
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#3
10-22-2002, 11:31 PM
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RCA clones
I believe RCA sold licenses for the use of its design to avoid accusations of having a monopoly on the technology. At least this is what I've read about RCA clones from the 1940's sets by Crosley, Fada and others (with chassis identical to late-production 8TS30's) on up to the Philco and Sylvania 21" color sets. I've long suspected that RCA might have sold the PC boards (or licensed templates) for the color sets. All the circuit boards look alike, but the chassis of the clone sets don't always look like an RCA chassis. Weren't the HV cages always at least slightly different on the RCA clone chassis?
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#5
10-23-2002, 12:46 AM
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andy,
That is a really nice score! I delaminated one of these badly cataracted CRT's last summer in my RCA, CTC-20 successfully so it can be done. Just be careful and wear eye and body protection. Your's looks great emission wise. I have a 1966 Philco and the chassis in it has boards that resemble RCA but the main board has a quadrupule diode tube on it that I've never seen on an RCA color set. Here's a picture of my Philco chassis. I don't have the model number handy. Sorry. Here it is with the back off. I got a little over zealous with the compressed air when I was cleaning it out and accidentally damaged the tube layout sticker.  This one has the 21FBP22 so no chance of cataracts. The CRT is like new.Rob Last edited by Rob; 10-23-2002 at 12:51 AM.
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#6
10-23-2002, 11:10 AM
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RCA clones
Hi Andy,
I agree with the others. RCA had several ways of making money off other manufactuers of tv receivers. They would supply under license certain componets that other companies would intergrate into their own designs on their own assembly lines. Or they might build for other companies on the RCA assembly line chassis designed to others specs. And they would build sets that were just rebadged RCA's with different cabinets or logos. Sets sold by Sears or Wards among others fell under this catagory. This still continues to this day with analog sets, vcrs and dvd players ect.
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#7
10-23-2002, 08:39 PM
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Andy, nice score by the way!
__________________
http://www.stevehoffman.tv
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#10
10-24-2002, 11:38 AM
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Kudos
Andy,
In my previous post I failed to congratulate you on this great find. In regards to the picture tube problem. Wasn't this problem discussed on either this forum or the Antique Radio Forum with several solutions submitted by members? Check out some of the previous discussions.
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#13
10-24-2002, 11:23 PM
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John,
Looking good. The crt makes a good white in the first picture and the convergence from what you can tell from a thumbnail looks good too. My CTC10/11 has only a B&W picture and I have not pulled the chassis to diagnose it further than test/replace the tubes in the chroma section that made no difference. It doen't even appear that the burst gate is opening and rocking the H. hold didn't affect it at all. Playing with my vintage TV's has taken a back burner status with my recent push in audio R&D. Are you planning to sell this one too? Rob
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#14
10-25-2002, 12:04 AM
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Rob,
It definitely sounds like the burst gate is not triggering on your set. Check for bad caps, loose connections, etc. first, but it might be out of alignment. These sets are known for their chroma circuits being picky with their alignment, so if you follow the chroma alignment procedure in the Sams under Miscellaneous Adjustments, that's likely to solve the problem. You'll need a stable 3.58 MHz signal and a VTVM. Sweep and marker generators are also recommended to get it right on target. This set was sold shortly after I started the restoration. When I posted the screenshots of the set during the initial testing, I was approached with a pretty good offer. I accepted and the buyer sent a deposit, so I cleared a path to the bench as soon as possible (that took some time because there were a lot of heavy items in the way that I was storing temporarily). So far, the set looks like it's coming along nicely. I've got a few finishing touches to go, then it will be ready. John
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