Name: 20 Use: Glass tube type used as output amplifier in dry-battery-operated receivers. Notes: Requires a 4- pin socket. |
20 Power Triode Data Source. . . . . . . . . RC-10 & RC-15 Heater or Filament Voltage . 3.3 volts Heater or Filament Current . 0.132 amperes EIA Base . . . . . . . . . . 4D Substitutes. . . . . . . . . None |
Capacitances and Design Maximum Values C/in. . . . . . . . . . . . 2.0 pf C/out . . . . . . . . . . . 2.3 pf C/gp. . . . . . . . . . . . 4.1 pf Maximum Plate Voltage. . . 135 volts |
Typical Operation as a Receiving Tube: Description Ep Eg Es Is Ip Rp TC AF Zl PO -------------------------------------------------------------------- Class A Amplifier 90 -16.5 - - 3.0 8000 415 3.3 9600 0.045 Class A Amplifier 135 -22.5 - - 6.5 6300 525 3.3 6500 0.11 |