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Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets. |
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12th Dec 2017, 4:32 am | #1 |
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Location: Maroochydore, Queensland, Australia.
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CRT Re-Building kit.
Recently I saw an advertising flyer on ebay in the USA. I bought it (attached, a scan I just made of it). I did this rather than just copying and pasting the image as it wouldn't be fair on the seller.
For $2,875.00 in July 1969, you could buy two assemblies in cabinets that were just 40 inches x 66 inches and 30 inches x 65 inches high, containing everything "all tools" required to re-gun monochrome (or color) CRT's. All from the C.R.T. equipment Co, Nashville. One machine was called a "sealing machine" the other on the right an "oven-bombarder combination" Given the technical difficulties of the task involved, it is astonishing they did it with the gear in just these two cabinets. I would buy this assembly stat, if it were for sale today, even at inflation adjusted prices. I wonder if somewhere in an old abandoned storage warehouse in the USA there is one of these, sitting in a dusty corner, now wouldn't that be the find of the century ? And its not just country & western music that comes out of Nashville. |
12th Dec 2017, 5:09 am | #2 |
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Join Date: Dec 2013
Location: Middlewich, Cheshire, UK. & Winter in the Philippines.
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Re: CRT Re-Building kit.
If you can find the kit I can run it but I can't build the guns.
How did they use it without a glass lathe? |
12th Dec 2017, 5:16 am | #3 |
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Join Date: Oct 2016
Location: Maroochydore, Queensland, Australia.
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Re: CRT Re-Building kit.
Replacement electron guns and gun parts were once cheap. Without them though it is still possible to replace just the heater-cathode part with small spot welding tool. I have a gun where I did this once, but to attach the new filament I used miniature screws and nuts because I didn't have a spot welder.
It would be interesting to see what the instructions would have looked like for this gear, they say easy to use ! |
12th Dec 2017, 3:17 pm | #4 |
Octode
Join Date: Nov 2004
Location: Hebden Bridge, West Yorkshire, UK.
Posts: 1,885
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Re: CRT Re-Building kit.
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12th Dec 2017, 3:21 pm | #5 |
Moderator
Join Date: Jun 2003
Location: Oxford, UK
Posts: 27,787
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Re: CRT Re-Building kit.
There must still be examples of these machines sitting around in sheds and basements, long forgotten about. That's if they work of course, and they aren't just snake oil.
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12th Dec 2017, 4:21 pm | #6 |
Octode
Join Date: Jul 2005
Location: Newport, Gwent, UK.
Posts: 1,623
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Re: CRT Re-Building kit.
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12th Dec 2017, 6:04 pm | #7 |
Pentode
Join Date: Feb 2004
Location: Columbus, Ohio, USA
Posts: 150
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Re: CRT Re-Building kit.
We have one of them at the museum:
http://www.earlytelevision.org/crt_color_champion.html We have incorporated the oven into our facility: http://www.earlytelevision.org/crt_r...at_museum.html |
12th Dec 2017, 8:54 pm | #8 |
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Location: Maroochydore, Queensland, Australia.
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Re: CRT Re-Building kit.
Steve,
I didn't know you had one at the museum, that is great. Reading through the operating instructions I get the impression it still would be quite an art to master . The whole notion of small business Mom & Dad style CRT rebuilding is remarkable. I was also interested in the remark about how rare 3kp4, 7JP4 and 12k and 12LP4's are becoming. I mentioned before on a thread how Thomas Electronics in the USA re-gunned and re-screened a 12LP4 for me and turned it into a 12kP4, but that was in the mid 1980's. 7JP4's, being a electrostatic deflection wide neck (probably Pyrex ?) tube will be a real challenge to repair. Do you have any stocks of P4 phosphor ? The ultimate would be to attempt a re-screen. |
21st Dec 2017, 11:15 am | #9 |
Heptode
Join Date: Jul 2009
Location: Stoke-on-Trent, Staffordshire, UK.
Posts: 719
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Re: CRT Re-Building kit.
I just happened to catch the end of (How it's Made on Quest TV (S10 ep4) where they showed a crt rebuild (or a new build, I literally caught the last minute or two)... it looked like a 17inch 70 degree tube.
The Company was Lexel Imaging Systems, or something similar. I wish they would refrain from squashing up the credits to an unbelievably small size. Most interesting thing was that they made the guns themselves... and I wonder whether they still can. Some links from a quick browse: http://www.lexelimaging.com/crt_products.html http://lexelimaging.com/ https://www.bloomberg.com/research/s...ivcapId=669128 |
22nd Dec 2017, 8:51 am | #10 |
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Location: Maroochydore, Queensland, Australia.
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Re: CRT Re-Building kit.
That is very interesting DangerMan, I will contact them in the new year and see if they could be encouraged to take on CRT rebuilds, if they would it would be fantastic.
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28th Dec 2017, 1:57 am | #11 |
Heptode
Join Date: Oct 2005
Location: Olympia, Washington, USA.
Posts: 663
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Re: CRT Re-Building kit.
Last I heard, Clarke Electronics in Portland Oregon, USA had several semi trailers full of CRT rebuilding gear. He did want rather a lot for it, If I remember right. Steve could tell you better.
I believe there are no more rebuilders left in the USA now. Steve & the Early Television Museum are "it' so to speak. I friend of mine and I had considered getting into the rebuilding gig with Clarke's equipment, but decided that we couldn't make a living at it. Frank B |
9th Jan 2018, 10:44 pm | #12 |
Heptode
Join Date: Jul 2009
Location: Stoke-on-Trent, Staffordshire, UK.
Posts: 719
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Re: CRT Re-Building kit.
I found the "How It's Made" piece on YouTube: there are at least two versions, one being shorter than the other.
The oldest seems to date back to 2011. If anyone is interested they are here: https://youtu.be/MsMsZaSz3Fk and https://youtu.be/qp6tNaUvfNI Pete |