I see.... Well maybe someone turned it on and as the filaments burned out they left a blackened spot....? I've seen it in light bulbs as they go bad. Is there continuity on the filaments? My ctc5 is dark like that near the base, I just thought the getters were down there......? Is it normal...?

I was wondering about this as well. If it does not have that same ridiculous glass->metal->metal->glass bond ring around the screen then it might be a heck of a lot easier to rebuild it...Thus getting another rare 1954 color set working.

The 15HP22 unfortunately has the same envelope construction as the 15GP22.

Thanks for sharing Dave. Working or not, it's always good to find examples of these early tubes surviving the years. Super photos.

See now if I had a time machine I could go back take a few of those dud tubes take a newer tube get the design fixed back in '53 and we would be up to our ears in working 15G based sets.....

In short, we should be working on building a time machine, not rebuilding dud 15gp22's

I think if I went back in time I would have named the tube 15SQ22 for "Improved Design by the Squirrel"

Thanks also for posting the picts and the replies!

Check Ohms
 

Would be interested if you still have continuity on the filaments ?

Is the visible mounting hardware typical of Westinghouse?
Interesting to note "E4" on the base, neck, and neck label. And all in a row.
The neck label says "regular order".
In the first pic, to the right of the riveted seam of the metal shield, is some writing. What might it say?
Phil

We have a prototype Westinghouse set at the museum. It is possible that it once had a 15HP22 in it, but there is no way to find out.

Another interesting thing. The CRT shields were apparently labeled with the same serial number as the cabinet backs. We have 6 of these numbers in our database, ranging from 005284 to 006226 (the number on Dave's shield). This might indicate that his tube was fitted in one of the later sets rather than a prototype.

The date on his tube is April of 1954, which is the same month that Westinghouse started selling the set.

Didn't the Westinghouse become available sometime in February?

Well, we are both off by a month. It was first sold in March.

http://hugelolcdn.com/i700/53403.jpg

I have meditated on the subject and have released the inner energy of my multimeter into pin 1 however no enlightenment was experienced at pin 20.

In other words, I guess it leaked while in service and the filament burned out.

The HV cable assembly looks like a Westinghouse (note the in-line connector the plate cap of the 6BD4).

Steve, Got to give this one to Dave Roper by a nose. The earliest dated ad I have offering the Westinghouse 840CK 15 for immediate delivery was the N.Y. Times, Feb. 28, 1954.

-Steve D.

15H Tube
 

I am assuming that this tube has a metal cone and glass face, similar to the 15G. Also, that this seal would be the likely cause of going to air.

Correct?

Forgive me for not remembering, but would this tube be a possible rebuild candidate, if that ever happens at ETF? :scratch2:

John Folsom had said:

Therefore the big problem in dealing with the welded flange is the same on this tube.

The difference is the screen. The design of the 15G apparently makes it susceptible to problems during the rebuild process. According to miniman82, the mass of the screen inside the 15G makes the ramping of heat during the rebuild process a pretty ticklish affair. This tube has a conventional screen, so based on what I've heard from the experts, I'd guess the 15H would have a greater likelihood of a successful outcome. As long as the leak problem can be solved. Nick? Jerome? Bob? Steve? Please correct me if I'm wrong.