Name: 71A Use: Glass tube type used in output stage of audio frequency amplifiers. Notes: Requires a 4- pin socket. |
71A Power Amplifier Triode Data Source= R-10 & RC-15 Heater or Filament Voltage= 5 volts Heater or Filament Current= 0.5 amperes EIA Base= 4D Substitutes= None |
Capacitances and Design Maximum Values: C/in. . . . . . . . . . . . 3.7 pf C/out . . . . . . . . . . . 2.1 pf C/gp. . . . . . . . . . . . 7.4 pf Maximum Plate Voltage . . . 180 volts |
Typical Operation as a Receiving Tube Description Ep Eg Es Is Ip Rp TC AF Zl PO ----------------------------------------------------------------------- Class A Amplifier 180 -40.5 - - 20 1850 1620 3 5350 0.7 Class A Amplifier 135 -27 - - 17.5 1520 1520 3 3500 0.37 Class A Amplifier 90 -16.5 - - 12 1330 1330 3 3200 0.125 |