New 15GP22 on ETF Classifieds
 

Anyone see this?

http://www.earlytelevision.org/classified_page.html

First listing under Parts, etc. for Sale

Yep! Called him 2 days ago. He called me back this Am but I missed the call. He said he would call back again this evening.

I just spoke with the owner of the tube. He purchased it new from the RCA distributor as a spare to install in a ct100 that he owned back in the mid 60's. He never got around to restoring the ct100 and so the tube has been sitting in the loft of his barn in Michigan ever since. The ct100 was left with a relative out east and when they closed the business out there the ct100 was trashed with many other electronic items.

He did not know if the 15GP22 was still good as it has not been tested. He is going to try and see tomorrow if the getters are still silver. If they are, then chances are good the tube is still good as it was never even hooked up to a tester since it was received.

I will post here again as soon as I hear anything about the condition of the tube.

Bob

Good luck Bob, I hope they're still silver.

I got a message from the owner of the tube today. He is not sure about the condition of the getters on the tube. He said they are not silver. I am trying to set up a meeting with him to test the tube for him. I am waiting to hear back to see if he wants to take me up on my offer.

More details to come as things develope.

Bob

I hope it's still good, but am doubtfull because of the storage conditions. If it was stored in a barn, it is highly doubtfull the seal would be any good on it due to the extremes in temp. Even if that tube was stored in a climate controlled environment, it would be suspect due to the nature of the design. If the tube is good, it would be worth his asking price, but if bad, pretty high for a dud.

Does anybody know offhand how long the 15GP22 was in production? I didn't realize you could buy a new one in the mid-1960s.

Phil

An article by EDWARD W. HEROLD in the Proceedings of the IEEE, Vol 64, No. 9, Sept. 1976 says that it was introduced in 1953 and only had limited production in 1954. It doesn't say that production ceased after that, but they seem to imply it.

The article is called "A History of Color Television Displays." I don't think I'll have any luck, but I'll see if they'll let me post it.

John

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From the 1965 Allied Radio catalog;

15GP22 $135.15
21AXP22A 103.77
21CYP22A 103.75
21FBP22 108.18
21FJP22 119.11

Even if a CRT was bought new in the 1960's, it could have been sitting in a warehouse for years already then. The number of replacement CRTs sold at well over $100 each, plus installation, for the relatively few small-screen color TVs still in use long enough to need a new tube, was probably very small. I would not doubt if less than 100 of those CRTs were ever replaced in consumers' homes nationwide.

Where have all these NOS tubes gone?

- Eckhard

Testing of the tube will most likely occur the weekend of the 28th and 29th.

I believe RCA had excess inventory that was warehoused for sale as replacements. That is probably where replacement tubes came from. RCA also had the ability to rebuild tubes, and from what I uncerstand you could obtain a rebuilt crt and had to return a dud. Of course this is just hearsay and there is no way to confirm this.

Many of the 15G's we see have been renecked and rebuilt. No doubt some of the renecked/rebuilt tubes we see did not pass final inspection and were sent back to be re-worked.

A visitor to my website mentioned that he rebuilt a CT-100 in the 1960s. He got a used 15GP22 that had served in a Conrac reference monitor at a local TV station.

Phil Nelson

With the exception of the 15GP22, I would assume they went into color TV sets of the early/mid 1960's when their CRTs went out in the early 1970's, only to be thrown out later in the 1970's when something else (fly, yoke, power transformer or tuner) in those failed.

The 15GP22s pose another question. There may have been little demand for those tubes, as so few 15" color roundies had been made, and their owners may have decided to upgrade to a larger picture when their CRTs failed.