(under subclass 157) Subject matter wherein the coupling between the two cascaded amplifying devices is from a grid, such as the screen grid, suppressor grid or control grid, or from between such a grid and an anode of the preceding amplifier device (of the vacuum tube type) of the two cascaded devices.
SEE OR SEARCH THIS CLASS, SUBCLASS:
42, for amplifiers having secondary emission amplifier devices wherein the output may be from a secondary emissive electrode.
192, and 195, for output coupling from a grid, such as the screen grid, suppressor grid or control grid or between such a grid and the anode.
SEE OR SEARCH CLASS
324, Electricity: Measuring and Testing, 124, for inverter amplifiers combined with measuring means where the output is from the control grid.
