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#1
08-26-2012, 09:56 PM
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New 9-PC-41 owner
Just brought it home today.
 The set is complete and seems to be unrestored, with original tubes, knobs and back. I honestly don't know whether to try and sell it as is or rebuild. I have no problem with rebuilding as I have a lot of B&W and color experience from working in tv shops in late 60's early 70's, but zero experience with projection. But one problem, I have long ago rid myself of all test equipment with the exception of a 707 tube tester (which will get a workout with this set!). Are critical items still available at a "reasonable" price? How much is a crt for this? IF I get more into this I will seek the guidance and advice of you experts out there. Phil Last edited by reeferman; 08-27-2012 at 08:39 AM. 
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#2
08-27-2012, 07:22 AM
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Nice. Yours is the second 9-PC-41 found his month and mentioned here.
You two ought to start restoration at same time. I vote that you restore it instead of selling it. I don't know anything about the RCA projection TVs but there are several folks here who do. Nice find. Carl
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CW 1950 Zenith Porthole - "Lincoln"
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#4
08-28-2012, 09:05 PM
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There are some parts that are always missing on these sets. Your sweep chassis cage is there, the remote is there, and the holy grail of missing parts, the back is there!!!!! I've never seen a picture of an original 9PC41 back, much less seen one in person. Now, about selling as-is, these sets don't have much market value, but they are fun to work on and always draw attention. If you decide to restore the set, my suggestion is to get a parts set. I picked up my first 9PC41 on eBay for peanuts and then spent $200 for a parts set. Unfortunately when I got the parts set home, it looks more interesting than my first set, and I can't force myself to part it out, so I buy a second parts set without a cabinet so I won't be tempted by looks. Then going to pick up those chassis without a cabinet, up pops an 8PCS41 in the ETF auction and I bids 20 bucks and gets the set! There is a picture of my 4th RCA projection in the fifth post in the thread at http://www.videokarma.org/showthread.php?t=254448 My wife took the picture just as the set was about to jump in the back of my car to follow me home. I've been itching to get started on these, but I also gave away most of my test equipment in 2007 when I moved, so my first project has been scrounging up and rebuilding one of everything needed to work on these. If you want to get a quick glance at the schematic: http://www.earlytelevision.org/tv_sc..._diagrams.html or: http://www.earlytelevision.org/image...-Sams-90-9.pdf However, to work on the set, I'd suggest the place that ChrisW6ATV mentions http://agtannenbaum.com They have the original cleanly printed RCA factory service manual. If you want to see some of the issues in the Sams, look at your 1949 light barrel and then look at the 1946-1948 light barrel in the Sams. Tannenbaum does not mention that the factory service manual does not include the alignment instructions, but refers you to the earlier 630TS. You can download a free 630 factory manual either at ETF or at Vintage Radio & TV: http://www.myvintagetv.com/Apple%20P...%20Service.pdf Oh, resist the temptation to plug a line cord into the AC interlock as it is wired as a dead short. Some one had apparently done that on one of my sets. The AC line is hard wired to the chassis and the interlock just shuts off the power supply. James.
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#5
08-28-2012, 10:30 PM
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I appreciate your lengthy reply, suggestions and references. I do have the Sams, thank you.
The back is just a simple piece of Masonite. Nothing fancy but like most Masonite it has a crack! Among the first thing I need to do is to remove the four chassis and give them a once over. Also at the top of my list is checking the CRT. It is the original with a '48 date code. If it is no good, end of project, Ebay time. I would really like to get it going. It may be a while before I get back with updates/questions. Thanks again Phil
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#6
08-29-2012, 08:25 PM
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Quote:
Regards, Cliff
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#11
09-02-2012, 09:22 AM
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I was fortunate enough to have a complete back cover for my 9-PC-41, and managed to score a NOS 5TP4 picture tube about a month later. I've restored the audio chassis, the power supply chassis, and am about 80% through re-capping the RF chassis. Next comes the HV, which looks like a lot of work.
I vote that you should keep your set and restore it. They are super cool and always draw attention when someone comes over. They find it hard to believe that there were projection TVs back in the late 40s. http://videokarma.org/showthread.php?t=252908 Last edited by hi_volt; 09-02-2012 at 09:25 AM. Reason: added link to my 9-PC-41 posts
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#12
10-05-2012, 11:08 PM
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Update 10-12
I have removed all the chassis and tested all tubes.
11 tubes test bad on my 707 tester (ouch). Many good OEM tubes. Many replacements with '52 date code. CRT hasn't been tested but I've found a local guy who says he has a tester that will work on the 5TP4. Face of CRT looks very good, hopefully a good omen. I assume S/N on tube indicates a build date of the 291st day of 1948. Can anyone verify? With the exception of a (currently) burned resistor in the IF section, I can't see (yet) where any other repairs have been over the years What is the best way to clean grime off of a chassis? Phil
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#13
10-06-2012, 07:20 AM
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About any think like that or Simple Green or Orange Cleaner, etc. If it is really grimy I'd mask out things that should not get wet like coils and pots, spray a cleaner all over the top side and wash it off with a garden hose. I did that to my GE 805 TV chassis and it worked great. If you are skiddish about using a garden hose, spray some cleaner on some rags and wipe it off. Takes time. I remove all the tubes before I clean my chassis's then Deoxit the tube sockets. If you have rust, Naval Jelly will remove that but it also removes the Cadmium plating. If you like your chassis to have a shiny metal look, you can remove the Cadmium plating with Naval Jelly and Brasso Brass polish. Takes a lot of work to clean a chassis but it makes the recapping experience nicer. Carl PS: Don't spray cleaner or use the garden hose on the underside of the chassis - just the top side.
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CW 1950 Zenith Porthole - "Lincoln" Last edited by cwmoser; 10-06-2012 at 07:24 AM.
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#14
10-06-2012, 07:28 AM
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bad too. My Philco 48-2500 has 29 tubes including the CRT. How many tubes are in your RCA? There must have been 75 paper and electrolytic capacitors in my Philco 48-2500. Have you counted how many in yours? BTW, how are the mirror surfaces? Carl
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CW 1950 Zenith Porthole - "Lincoln"
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#15
10-06-2012, 08:26 AM
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Carl
I counted 37 tubes less CRT, Sams says it has 41. Haven't even looked at caps yet. Oops, a recount reveals three 1B3s and with the CRT that's 41 The mirror surface is covered with a layer of dust but seems to be in excellent condition. What do I clean that with? I would hate to damage it with the wrong cleaner/procedure. Thanks for the cleaning tips, but I'll stay away from the water. Phil Last edited by reeferman; 10-06-2012 at 10:42 AM.
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