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  #1  
Old 06-15-2011, 12:46 PM
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miniman82 miniman82 is offline
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Prototype set is here

Here are the first pictures!

The small pics have been uploaded for immediate viewing, for the large file right click/save as on the URLs below. WARNING: picture files are large, 3+mb. Expect long load times.

http://miniman82.4t.com/images/proto...t/IMGP4529.JPG
http://miniman82.4t.com/images/proto...t/IMGP4530.JPG
http://miniman82.4t.com/images/proto...t/IMGP4531.JPG
http://miniman82.4t.com/images/proto...t/IMGP4532.JPG
http://miniman82.4t.com/images/proto...t/IMGP4533.JPG
Attached Images
File Type: jpg IMGP4529A.JPG (146.0 KB, 415 views)
File Type: jpg IMGP4530A.JPG (138.5 KB, 309 views)
File Type: jpg IMGP4531A.JPG (126.6 KB, 235 views)
File Type: jpg IMGP4532A.JPG (120.3 KB, 182 views)
File Type: jpg IMGP4533A.JPG (123.3 KB, 249 views)
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Old 06-15-2011, 12:48 PM
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5 more.

http://miniman82.4t.com/images/proto...t/IMGP4534.JPG
http://miniman82.4t.com/images/proto...t/IMGP4535.JPG
http://miniman82.4t.com/images/proto...t/IMGP4536.JPG
http://miniman82.4t.com/images/proto...t/IMGP4537.JPG
http://miniman82.4t.com/images/proto...t/IMGP4538.JPG
Attached Images
File Type: jpg IMGP4534A.JPG (133.5 KB, 135 views)
File Type: jpg IMGP4535A.JPG (123.6 KB, 129 views)
File Type: jpg IMGP4536A.JPG (120.4 KB, 114 views)
File Type: jpg IMGP4537A.JPG (141.0 KB, 157 views)
File Type: jpg IMGP4538A.JPG (138.5 KB, 155 views)
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Old 06-15-2011, 12:49 PM
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miniman82 miniman82 is offline
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5 more.


http://miniman82.4t.com/images/proto...t/IMGP4539.JPG
http://miniman82.4t.com/images/proto...t/IMGP4540.JPG
http://miniman82.4t.com/images/proto...t/IMGP4541.JPG
http://miniman82.4t.com/images/proto...t/IMGP4542.JPG
http://miniman82.4t.com/images/proto...t/IMGP4543.JPG
Attached Images
File Type: jpg IMGP4539A.JPG (112.8 KB, 107 views)
File Type: jpg IMGP4540A.JPG (138.2 KB, 118 views)
File Type: jpg IMGP4541A.JPG (138.8 KB, 90 views)
File Type: jpg IMGP4542A.JPG (140.2 KB, 107 views)
File Type: jpg IMGP4543A.JPG (128.2 KB, 110 views)
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Old 06-15-2011, 12:50 PM
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Last 5.

http://miniman82.4t.com/images/proto...t/IMGP4545.JPG
http://miniman82.4t.com/images/proto...t/IMGP4546.JPG
http://miniman82.4t.com/images/proto...t/IMGP4547.JPG
http://miniman82.4t.com/images/proto...t/IMGP4548.JPG
http://miniman82.4t.com/images/proto...t/IMGP4549.JPG
Attached Images
File Type: jpg IMGP4545A.JPG (90.7 KB, 115 views)
File Type: jpg IMGP4546A.JPG (108.4 KB, 173 views)
File Type: jpg IMGP4547A.JPG (87.1 KB, 188 views)
File Type: jpg IMGP4548A.JPG (98.9 KB, 260 views)
File Type: jpg IMGP4549A.JPG (128.7 KB, 190 views)
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Old 06-15-2011, 12:51 PM
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I did not realize that you bought that set. Congrats! Looks like it will be a fun project! Looks like lots of electrolytic cans in there.
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  #6  
Old 06-15-2011, 01:01 PM
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Better'n Christmas when you were 5 yrs old...(grin)
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  #7  
Old 06-15-2011, 01:13 PM
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First thoughts:

It's obvious they were trying different things with this chassis; there are holes where parts should be, disconnected parts, and it has a generally unkempt look to it. Wires are routed in a military fashion, tied off and specifically placed. Some circuits like deflection and tuner/front end look like standard fair. Others are a complete mystery- I see no evidence of what would be a dead givaway as a standard looking delay line, but there is an empty spot on the underside of the chassis marked 'delay' (see pic IMGP4543.JPG).

The HV section is strange- there is a 6CD6 output in one of the sockets (the ST shaped one in image IMGP4536.JPG), but then there's also a 6BQ6 in the socket right next to it. No idea what that's about. Damper tube is a 6W4GT, which seems like it should be the incorrect tube for a color set. Most sets use 6AU4GT(A), so I'm not sure what to think there. HV rectifier is a 1B3, which again seems like small B&W style stuff. Color sets typically use higher rated tubes like 3B2 or 3A3. Same thing with focus rect, which is a 1V2 where most color sets use a higher rated tube such as 1X2B.

Picture tube is developmental C-73547, similar to the one at the ETF. Getters look strange to me, I think the tube might have gone to air since one of them is clear in the center. Either that, or they were too close to the glass at the time they were flashed and scorched the glass- I've seen that before on audio output tubes. Other than that, everything else looks pretty good. I now have the monumental task of figuring out how exactly this thing works, and to that end I will be focusing my efforts on the color section first. Bob Galanter has said he will try and stop by this weekend to have a look at it, and I'm hoping Mark will stop by with his tube tester.

Much more to come, stay tuned!
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Old 06-15-2011, 01:44 PM
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Very exciting! Are you going to draw a schematic of what is there?

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  #9  
Old 06-15-2011, 01:51 PM
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I might not have to, Ed Reitan has told me he may have a schematic from the early chassis somewhere in his library. I just need to wait and see what exactly this thing is, and we'll move on from there.
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Old 06-15-2011, 02:15 PM
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Nick, first, thanks for all the great hi-res photos. I am not sure when the 6AU4 was introduced, but this set may perdate its introduction. I have production 15" color sets with 1B3s in them, so it is not unheard of. Probably hard on the poor 1B3s, but they work.

You are probably planning to do this, but I suggest you make a tube chart, listing tupe type/mfg/date code. Also, a list of part numbers on all transformers, as these often contain date codes and manufacturer info.

It is anybody's guess if the CRT is still under adequate vacuum to operate, but the signs are encouraging. Of course, my Hawkeye rebuilt 15GP22 tests good, had beautiful getters, and lights up purple like a neon tube when voltages are applied! So you just can't tell by looking.

Do you have the missing tubes, or are these going to be part of the mystery? I don't see tube numbers marked anywhere.

Are any of the control labels readable? I can't tell from the photos.

This a a fantastic set, thanks for sharing. I look forward to your upcoming discoveries.
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Old 06-15-2011, 02:28 PM
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Wow!

Holy schmit, you are really gobbleing up some ultra-cool rare stuff lately. Your not trying to compete with the ETF, are you?

Hope you can get it to run. If that happens you might just have the earliest working single CRT non-mechanical color set.

Either way it should be a very interesting restoration.

Good luck!

Tom C.
PS: Now I know what the festive ocasion was, and wow that is one impressive ocaision.
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  #12  
Old 06-15-2011, 02:41 PM
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miniman82 miniman82 is offline
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Quote:
Originally Posted by John Folsom View Post
Nick, first, thanks for all the great hi-res photos. I am not sure when the 6AU4 was introduced, but this set may perdate its introduction. I have production 15" color sets with 1B3s in them, so it is not unheard of. Probably hard on the poor 1B3s, but they work.

You're welcome, John! At some point I should probably stitch them together to make one giant one, though it would take a long time to download. I don't know when the 6AU4 came out either, but I know we had previously speculated on the horizontal output tube- the 6CD6 in this chassis is dated the 17th week of 1951! Most of the rest of them date from '50/'52, with the 1B3 in the HV section showing 1958.

Quote:
You are probably planning to do this, but I suggest you make a tube chart, listing tupe type/mfg/date code. Also, a list of part numbers on all transformers, as these often contain date codes and manufacturer info.

Yes, it's one of the things on my list. A lot of the parts on this chassis show RCA stamps, so I'm fairly certain this was made by them. Vert output transformer, power supply choke, some of the other RF cans, and of course the tuner are all RCA items along with some of the tubes (assuming those are the tubes it's supposed to have).

Quote:
It is anybody's guess if the CRT is still under adequate vacuum to operate, but the signs are encouraging. Of course, my Hawkeye rebuilt 15GP22 tests good, had beautiful getters, and lights up purple like a neon tube when voltages are applied! So you just can't tell by looking.

Of course, you are correct. I hope the test this weekend brings good news. I can look through the center of the base, and am able to see a slight patch of green around the evacuation stem which indicates copper corrosion. I hope it has not done any harm.


Quote:
Do you have the missing tubes, or are these going to be part of the mystery? I don't see tube numbers marked anywhere.
It's currently missing 2 tubes, no idea what they are or what they do. Part of the mystery! Perhaps Ed Reitan can shed some light on it?


Quote:
Are any of the control labels readable? I can't tell from the photos.
Yep! The labels are faded, but I can still see what they say. Written in pencil on the front of the chassis going left to right are:

horizontal/vertical hold, power switch/volume, contrast/brightness, and tuner.

On the back:

Pretty much the same stuff as a CT-100 would have. Purity, convergence, drives, backgrounds, focus, ect. Nothing that would make me say "a-ha!", but I don't know much else about the set at this point anyway.
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Old 06-15-2011, 02:45 PM
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After following some wires from the CRT socket, it quickly became apparent that there are 3 tubes (6BL7's) that are driving pins 3, 8 and 18 on the CRT socket (which would be grids on a 15GP22). I assume that means these are the adders or some part of the matrix, but the strange thing is there are also 3 diodes on terminal strips for each one as well. They look like the same type of thing that always seems to get used as a detector in IF strips. DC resto, perhaps?
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Old 06-15-2011, 03:20 PM
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I thought the getters looked a little small on that tube too. But it was never meant to live a long life, just test set. I think the same about the 1b3's in later daily use they proved unsatisfactory for color sets. Good luck with it and many thanks for the cool picts!
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Old 06-15-2011, 04:01 PM
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John: Almost missed it, but there's a control in the center of the chassis. It's only marked with a 'C', so I assume it's the color control.
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