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#31
01-25-2015, 01:44 PM
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Then I need a HV probe!
I spotted a similar set in this abandonned house. There must be some service litterature for these somewhere! https://www.flickr.com/photos/urbex-...-33723086@N02/ 
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#32
01-25-2015, 03:36 PM
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Quote:
always just shorted the HV out but it does come back, much less each time. Wont kill you, I got nailed once a week for near 40 yrs. Being a hybrid is a matter of opinion. To me a hybrid is solid state except the audio out, hoz out, hoz osc, damper, vert out, & HV rect. All the low level tubes like 6GH8's are gone. The classic hybrid is the 4 tube Zenith. Hoz osc, hoz out, vert out & damper. The abandoned house set looks like the CRT got necked, just a parts set. I would guess the residents have seen the seedier side of life, what a dump ! 73 Zeno 
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#34
01-26-2015, 11:44 AM
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One thing you may want to try, is switching 6GH8's between different (6GH8) positions within the TV. First mark which one goes where, then try swapping them. This got my CTC38 which refused to synch going, until I could get my hands on some new tubes. Some functions ask more of the tubes than others do, so a weak one may be able to perform one function, while being unable to perform another.
The CTC-38 (and I presume 39) is indeed a hybrid, it contains lots of transistors (the whole IF section, half the VHF tuner, the UHF tuner, etc), as well as one IC. I think one thing which would be prudent to do, is get your hands on a CRT tester, and check the condition of the CRT, if it checks out well, you have a green light to put some effort into this TV. I have a CTC-38 as my "daily driver", and although it isn't perfect (well, what in life is), it's a whole lot of fun to watch and has given me many hours of entertainment. Last edited by maxhifi; 01-26-2015 at 11:52 AM.
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#35
01-27-2015, 05:27 AM
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I found an ad from December 7th of 1972 featuring the model number of my TV CCC991.
It's strange, there was a 26" solid state model that was less expensive. I guess it depended of the style of cabinet. I would have expected a greater price difference between the tube and solid state models. http://news.google.com/newspapers?id...5833%2C2474873  CCC991 by PhilR2, on Flickr
Last edited by Phil R; 01-27-2015 at 05:59 AM.
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#36
01-27-2015, 08:38 AM
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Price should be lower BUT yours has varactor tuning,
one of the first to have it. IIRC the price difference between a Zenith 4 tube hybrid & a solid state with the same features was $75-$100 USD back then. 73 Zeno
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#38
01-28-2015, 07:56 AM
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to repair. A matter of what you like. Your solid state Zenith is much the same as the 4 tube hybrid. Zenith kept much of the electronics the same til a major chassis change in 1979. If you could fix yours you can fix any of them. 73 Zeno
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#39
01-28-2015, 08:43 AM
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I suppose Zeno. but i was talking about the difference and now i know i have a quality tv and that's why i will keep my Zenith...I suppose also that i'm going to make some adjustments after racapping my Zenith ....The transistors are easy to change because they are just plug'n'play..
 thanks for the information about the difference.
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#40
02-03-2015, 04:18 PM
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I finally got the 5 6GH8 tubes and replaced them.
A bit better but it will need more work! http://youtu.be/b9FPPa5_UFY
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#41
03-23-2015, 02:05 AM
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The TV is still at the repair shop but today I got a spare Flyback transformer for it. I hope it's the correct one for this model!
it looks like this replacement model wasn't coated with wax like the original. RCA copied the improved design from aftermarket manufacturers or they just sourced them? The box says "made in Mexico", see the pictures below. Here's another ad I found: The larger version can be viewed in this link: https://www.flickr.com/photos/337230...n/photostream/  1972-CCC991 by PhilR2, on Flickr https://news.google.com/newspapers?i...g=4614,1799201 Last edited by Phil R; 03-23-2015 at 02:11 AM.
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#43
03-25-2015, 08:34 AM
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The wax is inside the red silicone outer cover, and coats the outside of the "tire." Looks like you got one of the last batch - RCA stopped production on the 113382, 113392, and 119834 in 1983 - your date code is 82244, late 1982 production. I worked at Cain Electronics in 83/84 and we offered both the RCA 119834 and the FLY312 for the 38/39 chassis. When RCA dropped the 119834 ( it still appears in my 1985 price guide at 71 dollars dealer net), Thordarson was close behind. Great find - they are rarer these days! Cheers,
__________________
Brian USN RET 22YRS (Avionics/Cal) CET-Consumer Repair and Avionics ('88) "Capacitor Cosmetologist since '79" When fuses go to work, they quit!
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#45
03-26-2015, 12:32 AM
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I got the flyback on eBay for $18, which I think is a decent price for a part with a high failure rate like these!
Dave, you are right about the video content. I don't have many DVDs and I didn't have an antenna connection where the TV was located. My rabbit ears with a decoder didn't get a single channel! The image wasn't stable for more than 1-2 minutes after playing with the AGC screw and the colors never got right. There were some noises I didn't like coming from the back of the TV near the HV cage. Having no test equipment or experience with TV sets and very limited knowledge about electronics. I brought the set to a local TV repairman who still wants to touch these sets! I don't think he did much to it since he got it but he seemed confident about fixing it with minimal parts and labor... Back in the 1980s, my parents did buy a few things to him including their first sound system with a CD player (and I remember very well the day he delivered, installed and demonstrated it 28 years ago!). I remember I was amazed to see a flat panel TV on the wall of his store back in 1987. If I remember well, that wasn't sold here but was for the Japanese market. Now, he operates his business at home and I think he still does antenna installations.
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