TubePad 6.0 Tube Chart

Quick Reference Data

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