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TJ Fullmusic 2A3/n Data Sheet

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.

2A3_01_en

 

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 μA
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.

2A3_02Fig. 4

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

 

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