3CX 20,000A7

      The 3CX 20,000A7 is a high-mu power triode intended for use as a zero bias Class B RF amplifier or Class C power amplifier or oscillator. Class B operation with zero grid bias offers circuit simplicity.In addition, grounded grid operation is attractive since a power gain as high as twenty times can be obtained.
      Here you can get some information about the characteristics of 3CX 20,000A7.The plate dissipation (Max.) is 20,000 Watts.The grid dissipation (Max.) is 500 Watts.The frequency for Max. rating (CW) is 110 MHz.The amplification factor is 200.It uses thoriated tungsten filament/cathode. Voltage is 6.3 Volts.Current is 160 Amps.Then is about the capacitance of grounded grid.Input is 61.0 pf.Output is 0.2 pf.Feedthrough is 360 pf.Next is about the capacitance of grounded cathode.Input is 61.0 pf.Output is 36.0 pf.Feedthrough is 0.2 pf.the The cooling system uses forced air.Base selects coaxial.The air socket uses SK-1300.The inner length is 8.75 mm and the whole is 222.20 mm.The inner diameter 8.31 mm and the outer diameter is 211.10 mm.The weight is 13.5 oz (6.15kg).