anybody have a extension for the 15gp22 that I can buy, borrow
or use to find my missing raster? thanks in advance,

Neil K8RX

Huh, say what?

Clarification-----picture tube extension cord

Thought your set worked already? Bob G has one, but he's very distracted by family issues right now.

I have one but it's only 1 foot long. I that enough length? It's fits the 21" tube. Not sure if they have the same pin-outs and base

I believe that the 15Gs had a different socket with more pins.

The 15GP22 has a 20-pin base. The nearest I know of is a man (named Terry if I remember right) who found either just the part number or an actual source/quantity of the correct 20-pin sockets, that was still sold/made for photomultiplier tubes in the 1970s, I think. It was something like a Cinch-Jones PM20 or 20PM socket. I would like to have one of them so I can make a CT-100 (CTC-2) adapter for my test jig. I have not heard of any sources for the plug, though.

You can use RadioShack jumpers & nails that fit socket
The nails that fit these sockets are 8-Penny Finishing Nails

I made one up at one time, using the base off a military electrostatic tube of some sort, and a socket from a fire-damaged CT-100 chassis. I remember having a problem with the convergence anode arcing though, and I wasn't able to solve it.

Charles

part number or an actual source/quantity of the correct 20-pin sockets, that was still sold/made for photomultiplier tubes
Pete Deksnis had a photo of one on his former website. That was some time ago. You can still find specs for such sockets online:

http://www.google.com/search?q=PMT+SOCKET+20-pin+JEDEC+B20-102&rls=com.microsoft:en-us:IE-Address&ie=UTF-8&oe=UTF-8&sourceid=ie7&rlz=1I7DKUS_en

The $64K question is whether anyone actually stocks 'em.

Phil Nelson

A company called OE Technology www.oetech.com used to have some 20 pin PMT sockets, but my link to their website no longer works, so maybe they are gone....?

Phil, I got Terry's name and the other information from the archive of Pete's Web site.

I took your Google link and ran with it, and got at least two part numbers for that socket: Photonis FE-1120 and Hamamatsu E678-20B. Photonis makes a photomultiplier tube, the XP2262B, that appears to use a base similar to the one on the 15GP22. That base is in fact the number you found, JEDEC B20-102. If that company will sell both the base and the socket, Neil could make the extension he needs (using HV wire on pin 13 and some kind of high-voltage silicon to seal it perhaps).

This is the back story re the connectors: Terry Wise acquired a number of factory-packaged Cinch 20-pin sockets that are identical to some CT-100 production sockets. He was kind enough to ship me one, which I used to make a 15GP22 Beltron-adapter, and he contributed the rest to the ETF. I don't know if any are still available (if so, a contribution to the ETF would of course be appropriate); contact Steve McVoy.

Also, Neil I have an untested-by-me multi-foot-long 15GP22 extension cord that was made about 45-years-ago. You can borrow it if you like, but you should ring it out first before using. Historic Data: the connectors on this particular cable actually came from the technical department of CBS at 485 Madison in Manhattan. Photo is it hanging on the wall of my tiny workshop.

Pete

Wow. What an interesting and convoluted trail your 15G connector will have followed if Neil should borrow it.

Thanks for the notes, Pete. Just now, I realized that if I make a test jig adapter, I will need a plug (substitute CRT end connector), not a socket. Oops... Maybe I can get lucky with this company Photonis.

Pete, sent PM regarding extension
Neil

I am Terry who had the sockets and other parts, I donated all of those to Pete and or the ETF, so I don't have any more, However it is the same socket used on the older Photomultiplier tubes. you would have to do a seach online about these tubes and you will be able to match them up with a socket which is the same thing.

Thanks Terry

Thanks, Terry, that seems to match up with the comments I posted earlier.

Hello Gentlemen,

Helly Wiseguy - Terry, nice to hear from you.
PS: I am the proud keeper of Terry's CT-100 right here in Paris.

For ChrisW6ATV here's are some useful documents concerning the 15GP22 20 pin Jedec connector. Data was Scanned from the C73599 RCA developmental tricolor tube (Lab 15GP22 precursor). Courtesy of Chuck A. & John Folsom Jr who obtained copies from this priceless RCA lab data.

3x already posted documents here:
http://videokarma.org/showthread.php?t=247735

see middle of page 3 of this thread.

I also "followed the trail" to Hammamatsu Photonics. No help there & no reply to several Mails sent to their sales office here in France.

Here is their worldwide site : http://www.hamamatsu.com/

You might have more luck than i did.

Problem was solved thanks to the kindness of John Yurkon who sent me a base - Thank God for HUGE PMT's being used in high-energy physics research.

Hope this helps,

Best Regards

jhalphen
Paris/France

Thank you, Jerome.

I also got my 20 pin socket from OETECH where John Folsom got his. I ordered some old RCA phoatomultiplier tubes for the male end and they also had a Female socket. Cost was about $80


I did a search and found this company. http://lancosockets.com/

It looks like Lanco has sockets for some 20 pin PMTs but I do not know if they are the same as the one on the 15GP22 There is a diagram on the Lanco site of the 20 pin socket they offer. You will have to figure out if it is the same as the 15G base.

Good Luck

Question time for Bob: so if you knew you could get new bases, why go through all that trouble to reuse the original socket when rebuilding a 15G? Only thing I can think of is originality, am I right?

Just seemed simpler to salvage the original bases. Once I figured out an easy method, it was a no brainer. And the cost is zero dollars too.

Sockets are a different story all together. Next to impossible to find 20 pin sockets.