Vacuum tube with an electron beam deflectable to one of two anodes
Basic self-oscillating circuit
Beam deflection tubes, sometimes known as sheet beam tubes, are vacuum 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 can direct the rectangular beam to either of two anodes in the same plane.
They can be used as two-quadrant, single-balanced mixers or (de)modulators with very linear qualities. Their mode of operation is similar to one-half of a Gilbert cell by applying an unbalanced signal f1 to the control grid and a balanced signal f2 to the deflection electrodes, then extracting the balanced mixing products f1 − f2 and f1 + f2 from the two anodes.[1][2] Similar to a pentagrid converter, the cathode and the first two grids can be made into an oscillator. Two beam deflection tubes can be combined to form a double-balanced mixer.
They need extensive shielding against external magnetic fields. The ballistic deflection transistors currently under development employ a similar principle.
^M. B. Knight (1960). "A new miniature beam deflection tube" (PDF). RCA Electron Tube Division. Retrieved January 22, 2017.
^H. C. Vance K2FF (1960). "SSB Exciter Circuits Using a New Beam-Deflection Tube" (PDF). QST. Retrieved May 30, 2013.{{cite web}}: CS1 maint: numeric names: authors list (link)
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