Classification-Dome-type or Aubergine-type bulb of glass, a white ceramic base with four-prong bayonet gold pins , oxide coated filamentary, carbon plate triode.
Application-Audio frequency amplifier where power outputs of approximately 22.5watts or less is required at relatively low plate voltages.
Dimensions-Dimensions, outline diagrams of the tube and bases, and the arrangement of electrode connections to the base terminals are shown in Figures 1, 2 .
Nominal operating conditions and parameters
Filament voltage””””””””””””””””””””””””5 V*
Nominal filament current””””””””””””””””””””2.4A
Plate voltage”””””””””””””””””””””””””400V
Grid voltage”””””””””””””””””””””””””£70 V**
Plate current”””””””””””””””””””””””””120 mA
Amplification factor””””””””””””””””””””””3.85
Grid to plate transconductance ””””””””””””””””8500 micromhos
Grid current””””””””””””””””””””””””” 0.05 ¦ĢA
Plate resistance””””””””””””””””””””””””450 ohms
Load resistance””””””””””””””””””””””””2.0 kohms
*Alternating-current filament supply or Direct-current filament supply.
**Alternating-current filament supply is used. The grid and plate returns should be connected to a center tap on the secondary of the filament transformer.
***Direct-current filament supply is used. The grid and platter returns are connected to the negative end of the filament.
Characteristics-Average characteristics
Figure 3 . shown typical curves of plate currents of grid voltage for several values of plate voltages. It is alternating-current filament supply.
Fig.3
Limiting Operation Conditions for Safe Nor-nor simultaneous ratings
Maximum plate voltage””””””””””””””””””””””450 volts
Maximum plate dissipation”””””””””””””””””””””80 watts
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