TubePad 6.0 Tube Chart

Quick Reference Data

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