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TheoryTron is a discontinued series of TVs created and marketed by Theorysonic from 1964 to 1989 and it was replaced by the current Nehervia television sets. It is available in NTSC, PAL and SECAM markets.


Theorysonic had entered the television market in 1964 along with the radio.

TheoryTron was criticized for its maximum frequency channels of 12, while its competitors' televisions had 13.

Watching UHF and cable TV channels requires a UHF converter or set-top-box for TheoryTron to watch more channels like channel 23.


Image Model Released Notes
TheoryTron TS-400.png TS-400 September 14, 1964 First TheoryTron-branded TV and also Theorysonic's first TV.
TheoryTron TS-415.png TS-415 August 13, 1965
TheoryTron TS-421.png TS-421 January 22, 1966
TheoryTron TS-430.png TS-430 June 26, 1968
TheoryTron TS-470.png TS-470 January 2, 1970
TheoryTron TS-484.png TS-484 March 13, 1971
TheoryTron TS-492.png TS-492 February 22, 1972
TheoryTron TS-500.png TS-500 September 14, 1974
TheoryTron TS-520.png TS-520 November 12, 1976
TheoryTron TS-535.png TS-535 July 3, 1977
TheoryTron TS-550.png TS-550 June 23, 1978
TheoryTron TS-575.png TS-575 March 13, 1980
TheoryTron TS-600.png TS-600 May 9, 1981 First TheoryTron model with stereo sound.
TheoryTron TS-620.png TS-620 February 22, 1982
TheoryTron TS-670.png TS-670 January 2, 1984
TheoryTron TS-690.png TS-690 May 19, 1984
TheoryTron TS-700.png TS-700 April 30, 1985 Last TheoryTron TV set.