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The 31LR8 is an audio power amplifier tube made by the well known Radio Corporation of America (RCA). The tube is a type of triode, meaning it is an electronic device consisting of three electrodes: the cathode, the anode, and the grid. The 31LR8 is noted for its high gain and wide frequency response, making it an ideal choice for amplifying both high and low frequencies in a range of audio equipment. The 31LR8 is also used in guitar amplifiers and other audio-processing applications. The tube is made from a ceramic material that is zero-doped, meaning it contains no foreign elements, making it a highly reliable device.