(under subclass 75) Subject matter wherein the amplifying device or devices involved are of the vacuum tube type and wherein the signal feedback is derived from an electrode thereof other than the anode or cathode and/or is applied to an electrode thereof other than the cathode or control grid.
SEE OR SEARCH THIS CLASS, SUBCLASS:
160+, for interstage signal coupling involving coupling to the screen grid, plate, suppressor grid (and grid other than the control grid or cathode). See search notes thereunder.
162+, for interstage signal coupling from a grid (from an electrode other than anode or cathode). See search notes thereunder.
