Quote:
Originally posted by jshorva65
Chuck mentioned in his description that the RA-101A was designed during the war, uses the same potentially lethal 60-Hz HV supply technology of pre-war designs, and that the RA-101B was equipped with a much safer RF supply for its HV. . . . Speaking of Dumont, I'm curious to know why they would sell the design for what later became the Trinitron tube to Sony. Wasn't it Dumont that invented this single-gun tri-color tube?
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The beginning of post-war manufacturing appears to be the transition point from lethal 60 Hz supplies to flyback & RF supplies. Philo Farnsworth invented the flyback HV supply in the early 1930's and held a patent on it. This may explain why other manufacturers did not initially use it. (Farnsworth patent #2,059,219 "Generation of the High Voltage from the Horizontal Scan Frequency" issued Nov. 3 1936).
Re: DuMont
The tube that led to the Trinitron was the "Lawrence" tube, invented by Dr. E. O. Lawrence, who also invented the Cyclotron. This was a concept on paper only, Dr. Lawrence never built the tube. DuMont obtained the rights to it and attempted to build it, discovering that the design was flawed. They had named it the "Chromatron" and were working to correct the design flaws when Paramount Pictures, who owned the controlling interest in DuMont, forced them to sell it to Sony for the cash. Sony then completed the development work, and introduced it as the Trinitron. Paramount's interest in DuMont was financial only, they were not interested in the development of television. They ultimately caused the collapse of DuMont.