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Originally Posted by Chad Hauris
There may be such a cache of 15GP22's somewhere ....
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In case you haven't seen this story:
In the fifties, for the motion picture industry, the Hazeltine Company developed a system for viewing motion picture internegatives as a positive on a tricolor CRT. It is known as a color film analyzer, and the first one used a 15GP22.
The tube-type color film analyzers are now all gone -- the last all-tube survivor was a model made in the late fifties that ultimately used a 21FJP22. It was in India, still running in 1995.
About 1996, a Mexican company traded in an old analyzer that used the 15GP22. It was totally inoperable, but had been used up to around 1975.
The company from whom I got this information had an inventory of six NIB 15GP22's in stock until 1997, when management decided to toss all the tube-based analyzer inventory to make room. So along with all the other spare parts, there are six 15GP22's buried somewhere in a Los Angles landfill.
So yes, chances are good that somewhere there are undiscovered NIB 15G's.