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M3-SRT8 is correct that most mechanical stations had stopped broadcasting by 1933. The novelty was gone, the depression was in full force, and the picture quality of mechanical TV made entertainment broadcasts impossible.
But electronic TV wasn't ready. Philo's image dissector wasn't sensitive enough, and the iconoscope was crude. RCA used a mechanical camera for their 120 line tests in 1934, and it wasn't until the end of 1935 that RCA's electronic camera was good enough to use in field trials starting in 1936.
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