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Tube Substitutions for:
2A3
Power Amplifier Triode

Type	Substitutes	Base Diagram
2A3	2A3H, 2A3W, 5930
Web References	2A3 (RCA) @ Franks Electron Tubes 2A3 (RCA (HB3)) @ Franks Electron Tubes 2A3 (Sylvania) @ Franks Electron Tubes 2A3 (Tung-Sol) @ Franks Electron Tubes 2A3 (Brimar) @ Franks Electron Tubes 2A3 @ RadioMuseum.org

RCA Radiotron Type 2A3
POWER AMPLIFIER TRIODE


MECHANICAL DATA

Bulb	ST-16
Base	Medium 4-Pin
Basing	4D

ELECTRICAL DATA

FILAMENT CHARACTERISTICS

Filament Voltage (A.C. or D.C.)	2.5	Volts
Filament Current	2.5	Amps

DIRECT INTERELECTRODE CAPACITIES

Grid-Plate Capacitance	13	��f
Grid-Filament Capacitance	9	��f
Plate-Filament Capacitance	4	��f

MAXIMUM RATINGS (Design Center Values)
SINGLE TUBE CLASS A AMPLIFIER

Plate Voltage	250	Volts
Grid Voltage1	-45	Volts
Plate Current	60	Ma
Plate Resistance	800	Ohms
Amplification Factor	4.2	X
Mutual Conductance	5250	�mhos
Load Resistance	2500	Ohms
Undistorted Power Output	3.5	Watts

PUSH-PULL CLASS A AMPLIFIER (Two Tubes)

Plate Voltage	300	300	Volts
Grid Voltage1	-62	-62	Volts
Plate Current (Per tube)	40	40	Ma
Load Resistance (Plate-to-plate)	3000	5000	Ohms
Total Harmonic Distortion	2.5	5	Percent
Power Ouput	15	10	Watts

NOTES:

1	Grid volts measured from mid-point of a-c operated filament.

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