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Name: 811A Use: Thoriated-tungsten-filament tube type used as AF power amplifier and modulator and as RF power amplifier and oscillator. Notes: Requires a standard four-pin socket and may be operated in a vertical position base down or in a horizontal position with pins 1 and 4 in vertical plane (pins 1 and 4 align straight up and down). |
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811A Power Triode Data Source. . . . . . . . . . . ARRL 61 Characteristics: Heater/ Filament Voltage . . . . 6.3 volts Heater or Filament Current . . . 4.0 amperes EIA Base . . . . . . . . . . . . 3G Substitutes. . . . . . . . . . . None |
Capacitances and Design Maximum Values: C/in. . . . . . . . . . . . 5.9 pf C/out . . . . . . . . . . . 0.7 pf C/gp. . . . . . . . . . . . 5.6 pf Plate Dissipation . . . . . 65 watts Maximum Plate Voltage . . . 1500 volts Maximum Plate Current . . . 175 ma Maximum Grid Current . . . 50 ma Maximum Frequency . . . . . 60 MHz |
Typical Operationas a Transmitting Tube Class of Service Ep Eg EgMax Ip IpMax Ig Drive Zl PO ------------------------------------------------------------------------ Class C Amp 1500 -70 - 173 - 40 7.1 - 200 Class C Mod Amp (Plate) 1250 -120 - 140 - 45 10 - 135 PP Class B Amp 1500 -4.5 170 32 313 - 4.4 12.4K 340 Class B Amp 1000 0 93 22 175 - 3.8 - 124 Class B Amp 1250 0 88 27 175 - 3.0 - 155 Class B Amp 1500 -4.5 85 16 157 - 2.2 - 170 |