UK Vintage Radio Repair and Restoration Powered By Google Custom Search Vintage Radio and TV Service Data

Go Back   UK Vintage Radio Repair and Restoration Discussion Forum > General Vintage Technology > Components and Circuits

Notices

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.

Closed Thread
 
Thread Tools
Old 12th Dec 2017, 4:32 am   #1
Argus25
No Longer a Member
 
Join Date: Oct 2016
Location: Maroochydore, Queensland, Australia.
Posts: 2,679
Default 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.
Attached Thumbnails
Click image for larger version

Name:	crt1.jpg
Views:	287
Size:	74.1 KB
ID:	153849  
Argus25 is offline  
Old 12th Dec 2017, 5:09 am   #2
Boater Sam
Banned
 
Join Date: Dec 2013
Location: Middlewich, Cheshire, UK. & Winter in the Philippines.
Posts: 3,897
Default 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?
Boater Sam is offline  
Old 12th Dec 2017, 5:16 am   #3
Argus25
No Longer a Member
 
Join Date: Oct 2016
Location: Maroochydore, Queensland, Australia.
Posts: 2,679
Default 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 !
Argus25 is offline  
Old 12th Dec 2017, 3:17 pm   #4
dominicbeesley
Octode
 
dominicbeesley's Avatar
 
Join Date: Nov 2004
Location: Hebden Bridge, West Yorkshire, UK.
Posts: 1,885
Default Re: CRT Re-Building kit.

Quote:
Originally Posted by Boater Sam View Post
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?
The frame on the left looks to have a small motor in the bottom left?
dominicbeesley is offline  
Old 12th Dec 2017, 3:21 pm   #5
paulsherwin
Moderator
 
paulsherwin's Avatar
 
Join Date: Jun 2003
Location: Oxford, UK
Posts: 27,787
Default 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.
paulsherwin is offline  
Old 12th Dec 2017, 4:21 pm   #6
yesnaby
Octode
 
yesnaby's Avatar
 
Join Date: Jul 2005
Location: Newport, Gwent, UK.
Posts: 1,623
Default Re: CRT Re-Building kit.

http://www.earlytelevision.org/crt_color_champion.html
yesnaby is offline  
Old 12th Dec 2017, 6:04 pm   #7
Steve_McVoy
Pentode
 
Steve_McVoy's Avatar
 
Join Date: Feb 2004
Location: Columbus, Ohio, USA
Posts: 150
Default 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
Steve_McVoy is offline  
Old 12th Dec 2017, 8:54 pm   #8
Argus25
No Longer a Member
 
Join Date: Oct 2016
Location: Maroochydore, Queensland, Australia.
Posts: 2,679
Default 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.
Argus25 is offline  
Old 21st Dec 2017, 11:15 am   #9
DangerMan
Heptode
 
Join Date: Jul 2009
Location: Stoke-on-Trent, Staffordshire, UK.
Posts: 719
Default 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
DangerMan is offline  
Old 22nd Dec 2017, 8:51 am   #10
Argus25
No Longer a Member
 
Join Date: Oct 2016
Location: Maroochydore, Queensland, Australia.
Posts: 2,679
Default 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.
Argus25 is offline  
Old 28th Dec 2017, 1:57 am   #11
FrankB
Heptode
 
Join Date: Oct 2005
Location: Olympia, Washington, USA.
Posts: 663
Default 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
FrankB is offline  
Old 9th Jan 2018, 10:44 pm   #12
DangerMan
Heptode
 
Join Date: Jul 2009
Location: Stoke-on-Trent, Staffordshire, UK.
Posts: 719
Default 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
DangerMan is offline  
Closed Thread

Thread Tools



All times are GMT +1. The time now is 3:24 am.


All information and advice on this forum is subject to the WARNING AND DISCLAIMER located at https://www.vintage-radio.net/rules.html.
Failure to heed this warning may result in death or serious injury to yourself and/or others.


Powered by vBulletin®
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Copyright ©2002 - 2023, Paul Stenning.