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G2 = "screen grid." Although it's in the same order of electrodes as a screen grid (second grid) in a small signal tube, it doesn't perform the same function (screening the control grid [grid 1] from capacitive coupling to the plate) in a CRT. Instead, it is used for setting the cutoff point of voltage between the cathode and G1.
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Old TV literature, New York World's Fair, and other miscellany
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