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*** The Ampliphase Ancestry ***

The BTA-50J Ampliphase



The BTA-50J was released in 1970 and featured the solid state BTE-20 exciter as standard. There were just 6 tubes in the transmiting circuits, which were the same arrangement as the 50H. The same line coupling/protection unit was also retained, with another 4 tubes. Very little information on these seems to be available, and it seems that only about six were shipped to stations in the US, and a similar number to overseas users. Rival transmitters, such as the 317 Doherty from Continental, and the pulse-duartion modulated MW50 from Harris were dominating the market. Ampliphase, it would seem, had passed its sell by date. The last unit to leave the factory in 1977 went to Guatamala where it joined an earlier unit to become a parallel pair.
RCA catalogue information describing the 50J, is more or less a re-print of earlier 50H information, but with the solid state modulator included. It would seem that even RCA had run out of anything new to say about their transmitter. As the above catalogue picture shows, even the "Ampliphase" logo had gone from the top of the transmitter, and the only identification was the new style (post 1966) "RCA" letters on the door of the first cabinet.

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