English: Beam deflection tubes were cathode ray tubes with an electron gun, a beam intensity control grid, a screen grid, sometimes a suppressor grid, and two electrostatic deflection electrodes on opposite sides of the electron beam, that could direct the rectangular beam to either of two anodes in the same plane. They were used as two-quadrant, single-balanced mixers or (de-)modulators. The circuit variant shown is self-oscillating.
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