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#47
06-01-2006, 04:35 AM
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Motorola
This Motorola has an octal socket on the back that may have been for a color adapter.
http://cgi.ebay.com/motorola-tube-TV...QQcmdZViewItem Some sets should go straight into the dumpster however and this is one of them! 
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#49
06-03-2006, 06:05 PM
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Vintage Admiral Happenings (1) and 2)
(1) My direction with the Admiral is to convert it to receive 1951 CBS Color broadcasts in monochrome. However the CA 100 color adapter it was originally to be used with was probably the Admiral equivalent of the CBS adapter Steve McVoy is now restoring. And so the set was probably never meant to be altered for b&w reception of CBS Color. Therefore, I ask, is there any historic value to such a conversion?
Sure why not. My justification for the effort is to mimic people who in 1951 would have converted their NTSC sets to receive CBS Color in b&w. Who knows if it was ever done? Why not do it now. Gernsback and others would have quickly published such stuff... I suspect the set will need a new output transformer if, according to vintage documentation, a 'correct' conversion is to be made. Fortunately, specifications for the 2-tap transformer are included in the CBS documentation. Maybe one can be made. Also, waiting to see how Steve McVoy's modification to the fly in a 9T246 he's adapting to CBS Color turns out. Am following that work here: http://www.earlytelevision.org/cbs_c...storation.html (2) Also, there's a vintage Admiral tuner question maybe someone can answer. Fine tuning is a function of the position of that spiral cam on the tuning knob in the photo. There's a wire from the LO to the vicinity of the cam, but I don't see how the Xc is varied by that plastic cam. Clearly there is because it works. What am I missing? There doesn't appear to be anything printed on the other side of the cam.
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#50
06-03-2006, 08:23 PM
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The plastic cam is the dielectric in the capacitor formed by the wire and post coming from the LO. As the amount of plastic (or phenolic) in between the post and chassis ground varies, the amount of capacitance to ground varies. It only takes a handfull of picofarads to do the job.
__________________
John Folsom
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#51
06-03-2006, 10:41 PM
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Thanks John. No wonder it looked like all dielectric. Guess I haven’t been around long enough!
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#52
06-04-2006, 12:35 AM
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BINGO! I have a complete 17K chassis and the color socket is fully wired. The socket had this really strange male socket in it. It was hell to get the darn thing out. I would be willing to donate the chassis minus the CRT to the cause. I need the CRT for another RCA project. I just got back from getting it. It was in my storage area in Georgia. I drove 700 miles today(round trip) and am beat. I will post more pictures tomorrow.
polaraman
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#53
06-04-2006, 07:54 AM
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That's it all right...
Your chassis would be the better choice for this project. I have a good CRT.
700 miles! Sounds like our yearly sprint to the ETF convention.
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#55
06-10-2006, 06:17 PM
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Polaraman,
I may be mistaken here. The photo looks to show a label that you may have peeled back to reveal the "color" label. If so what did the other label say. Also, do you know what year the Hallicrafters set was manufactured? Thanks, -Steve D.
__________________
Please visit my CT-100, CTC-5, vintage color tv site: http://www.wtv-zone.com/Stevetek/
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#56
06-10-2006, 08:43 PM
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Steve,
The other tag is the final inspection tag that is screwed on the chasis. I bent it back to get a good shot of the color tag. The color socket has a plug in it. I left it there as to not lose it. I can't wait to get it off the truck and get a good look. It will have to wait till next weekend. The Hallicrafters is model 21940 - SAMS 165 - 1951 or 1952. polaraman
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#57
06-10-2006, 09:53 PM
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Polaraman,
Thanks for clearing that up. Appreciate the photo. It's amazing that the inspection tag also survived all these years. -Steve D.
__________________
Please visit my CT-100, CTC-5, vintage color tv site: http://www.wtv-zone.com/Stevetek/
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#58
06-10-2006, 09:57 PM
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Amazing that Hallicrafters printed a 4-color label that almost no one would have seen. They must have been very enthused about the prospects of color TV to go to that expense.
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#59
06-10-2006, 10:09 PM
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This all prompted me to pull down my Admiral 17K22. It needed a new focus control installed anyway. Mine is stamped with the color adaptor information but lacks the socket; there is a piece of cardboard attached over the hole. Maybe this was after they gave up on the idea? It was built in '51 but I'd have to go look to see the exact date.
__________________
Bryan
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#60
06-10-2006, 10:09 PM
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The Hallicrafters back is also labled right above the color socket. The hole to the right is from the electrical plug. The CRT is a metal and glass 21AP4. The RCA CRT warranty tag from 1-8-57 is still in the set. Would this had sufficient light to produce a good color picture from a color wheel?
I just pulled the SAMS 165-6. The SAMS does show how the color socket is wired/installed. There is also a switch to go from B/W to color. The control diagram shows it to be on the front of the set. I will have to look tomorrow. More pictures to follow! bgadow, Post a picture of the cardboard covering the hole. polaraman Last edited by polaraman; 06-10-2006 at 10:53 PM.
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