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In Reply to: RE: OMG! Those look like they were hand made by Lee de Forest himself! nt posted by Ed Sawyer on March 29, 2017 at 10:18:03
I am guessing that the other two tubes are from the same or another French company of the same time period. I am cheating by using the vacuum tube history book pictured below.
I do love alpha Al's pictures.
I don't know much about these. I wondered what "Metal" meant. Didn't realize that was the manufacturer.
The tube in the center was made by Moorhead.
four pin tubes, as Moorhead was contracted in WWI to supply the British military who had been using the French tube designs.
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