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The 21JV6 is a miniature glass vacuum tube manufactured by the RCA Corporation. It is a pentode tube with a 4-electrode configuration, consisting of a cathode, grid, suppressor, and plate. It was used as a voltage amplifier in electronic equipment such as radios and televisions, and was also frequently found in guitar amplifiers. The 21JV6 has a maximum plate dissipation rating of 6 watts and a maximum plate voltage of 150 volts.