Classification-Aubergine-type bulb of glass, a four-prong bayonet pin tube, oxide coated filamentary,mesh plate, canbon plate triode.
Application-Audio frequency amplifier where undistorted power output of approximately 1.6 watts .
Dimensions-Dimensions, outline diagrams of the tube and bases, and the arrangement of electrode connections to the base terminals are shown in Figures 1and 2 .

As Single-Tube Class A1 Amplifier
Filament voltage……………………....2.5 V *
Nominal filament current……………. 1.5 A
Plate voltage…………………………. 250 V
Grid voltage………………………….. –50V**
Plate current…………………………...36 mA
Plate resistance…………………………1610 ohms
Amplification factor***……………….3.5
Load resistance………………………..3900 ohms
Grid current……………………………0.05μA

As Push-Pull Class AB2 Amplifier ( Two Tubes )

Fixed Bias Self-bias
Filament voltage ( A.C. ) 2.5 V 2.5V
Plate voltage ( Maximum ) 275V 275V
Grid voltage –68V**
Self-Bias Resistor 775ohms
Zero-Signal Plate Current 28 mA 72 mA
Maximum-signal Plate Current 138 mA 90 mA
Load resistance 3200 ohms 5060ohms
Total Harmonic Distortion 5% 5%
Power Output 18Watts 12Watts

*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 plate returns areconnected to the negative end of the filament.

Characteristics-Average characteristics

Figure 3.shown typical curves of plate currents as a function of grid voltage for several values of plate voltages. It is alternating-current filament supply.

Limiting Operation Conditions for Safe Operation-nor simultaneous ratings
Maximum plate voltage …………………………………………………275 volts
Maximum plate dissipation …………………………………………….10 watts

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