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3CX2500H3 a medium-mu metal/ceramic extemal anode power triode. Maximum plate dissipation for this tube is 4000 watts, and cooling is forced-air. At moderate voltages, relatively high power output can be obtained from the 3CX2500H3 as an amplifier, oscillator, or modulator. 4CX1000A A radial beam tetrode which is rated for 1000 watts maximum plate dissipation. The high current, low voltage, and high gain design makes it ideally suited for use in audio amplifiers or Class AB, RF Linear amplifier applications. 4CX1500BM is a radial beam tetrode which is rated for 1500 watts maximum plate dissipation. The high current, low voltage and low distortion design of the 4CX1500BM makes it ideally suited for use in audio amplifier or Class AB1 RF linear amplifier applications..