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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 ohm
Amplification factor***............ 3.5
Load resistance.......................3900 ohm
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		775ohm
Zero-Signal Plate Current	28 mA	72 mA
Maximum-signal Plate Current	138 mA	90 mA
Load resistance	3200 ohm	5060ohm
Total Harmonic Distortion	5%	5%
Power Output	18W	12W

*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.

　

Fig.3

Limiting Operation Conditions for Safe Operation-nor simultaneous ratings
Maximum plate voltage .........................275 V
Maximum plate dissipation ..................10 W