15GP22.... Good Evening Mr. and Mrs. America, and All the Ships at Sea . . FLASH!!!!

[John Folsom]

Tom,
An expansion on what Pete said about having the guns rebuilt: After the gun is removed, Bob Galanter uses an EDM (electro-dynamic machining) tool to mill out the old cathodes from the gun structure with micron precision. Bob built a custom jig to hold the gun assembly which allows the precision EDM machining to be done. Without Bob's expertise, the 15G project whold have come to a halt becausee the company which puts new cathodes and filaments back in ghe gun and mounts the gun on the new stem was no longer willing to attempt the difficult task of removing the old cathodes. I do not think they had access to EDM machining.

Tune in next week for final acceptance test results on the CRT rebuilt at Hawkeye.

[jeyurkon]

"Tune in next week..." That's like forever! At least when you're waiting for something exciting like this.

John

[jhalphen]

Hello Gentlemen,

While-U-Wait for more news on Bob's/John's 15G, why not read a bit?

I've scanned for you 4 interesting Color TV-related articles from the RCA Lancaster factory magazine:

- Milestones in color picture tube development - H.R.Seelen
- Development of cathodoluminescent phosphors - A.L.Smith
- Gasses & Getters in color picture tubes - Turnbull/Moscony/Month/Hale
- Colorimetry & contrast performance of color picture tubes - Ehemann/Rudy

RCA Lancaster: Main Directory
http://s281.photobucket.com/albums/k...ancaster%2069/

For those in a hurry, the link to the Gasses & Getters article (4 pages):
http://s281.photobucket.com/albums/k...tersinColo.jpg

Best Regards

jhalphen
Paris/France

[ohohyodafarted]

Interesting Read Jerome, Thank you!

[John Folsom]

Update: The 15GP22 from Scotty has arrived at my house. No damage, all appears well. The tube has not been based yet. Bob Galanter will arrive tomorrow, so I am waiting so he does not miss any of the fun!

[TubeType]

MAY GOD SPEED, JOHN FOLSOM.

Regards,
Terry Cheek

[stromberg67]

That's almost more beautiful than my Lovely lady Friend! Almost!
Great news!! Look forward to the first screen shots!

[Tomcomm]

Originally Posted by John Folsom

Tom,
An expansion on what Pete said about having the guns rebuilt: After the gun is removed, Bob Galanter uses an EDM (electro-dynamic machining) tool to mill out the old cathodes from the gun structure with micron precision. Bob built a custom jig to hold the gun assembly which allows the precision EDM machining to be done. Without Bob's expertise, the 15G project whold have come to a halt becausee the company which puts new cathodes and filaments back in ghe gun and mounts the gun on the new stem was no longer willing to attempt the difficult task of removing the old cathodes. I do not think they had access to EDM machining.

Tune in next week for final acceptance test results on the CRT rebuilt at Hawkeye.

Thanks John........Bob's custom jig and EDM (electro-dynamic machining) was truly the breakthru on this ambitious project. I imagine the crt vendor just had to slip his new heater/cathode tube into the hole Bob bored into the original cathode cylinder?? I would be very interested in the total rebuild cost with profit. Scotty quoted me $400 for my 21FBP22 which is a slam-dunk in comparison. Tom