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<< 2A3/n 2A3/c 2A3/SE Vacuum Tube




Classification- Dome-type or Aubergine-type bulb of glass, a white ceramic base with four-prong bayonet golden pins, oxide coated filamentary, mesh plate or carbon plate triode.

Application -Audio frequency amplifier where power outputs of approximately 3.5 watts 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 and 3.

Nominal operating conditions and parameters
Filament voltage* 2.5V
Nominal filament current 2.5A
Plate voltage 250V
Grid voltage** -45V
Plate current 60mA
Plate current 62.5mA
Amplification factor 4.2
Grid to plate transconductance 5.25mA / V
Grid Current 0.05 A
Plate resistance 800 ohms
Load resistance 2.5kohms

*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 4. shown typical curves of plate currents of grid voltage for several values of plate voltages. It is alternating-current filament supply.

Fig.4

Limiting Operation Conditions for Safe Nor simultaneous ratings
Maximum plate voltage 300 volts
Maximum plate dissipation 15 watts