NJ7P SQL Tube Database Query

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2A3
Power Triode

EIA Base & Outline

Substitute Data

Preferred Substitutes ......................... 5930
Substitutes ................................... 2DX4
Source ........................................ RCA RC-12 - 1934

Application

Source ........................................ RCA RC-12 - 1934
Glass type used in output stage of radio receivers and amplifiers. Requires four-contact socket and should be mounted in a vertical position.

Mechanical Data

Source ........................................ RCA RC-12 - 1934
Bulb .......................................... ST-16
Base Type ..................................... Medium 4-Pin
EIA Outline ................................... 16-1
EIA Base ...................................... 4D
Mounting Position ............................. Any

Electrical Data

Source ........................................ RCA RC-12 - 1934
Filament Voltage .............................. 2.5 V
Filament Current .............................. 2.5 A

Direct Interelectrode Capacitances (approx)

Triode
Source ........................................ RCA RC-12 - 1934
Input ......................................... 7.5 pf
Output ........................................ 5.5 pf
Grid to Plate ................................. 16.5 pf

Maximum Ratings (Design Center Values)

Triode
Source ........................................ RCA RC-12 - 1934
Plate Voltage ................................. 300 V
Plate Dissipation ............................. 15 W

Characteristics and Typical Operation

Class A Amplifier
Source ........................................ RCA RC-12 - 1934
Plate Voltage ................................. 250 V
Grid No. 1 Voltage ............................ -45 V
Amplification Factor .......................... 4.2
Plate Resistance (approx) ..................... 800 Ω
Transconductance .............................. 5250 µ
Plate Current ................................. 60 mA
Load Resistance ............................... 2.5K Ω
Power Output (approx) ......................... 3.5 W

Class A Amplifier
Source ........................................ RCA RC-12 - 1934
Plate Voltage ................................. 250 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 750 Ω
Amplification Factor .......................... 4.2
Plate Resistance (approx) ..................... 800 Ω
Transconductance .............................. 5250 µ
Plate Current ................................. 60 mA
Load Resistance ............................... 2.5K Ω
Power Output (approx) ......................... 3.5 W

Push Pull Class AB1 Amplifier
Source ........................................ RCA RC-12 - 1934
Plate Voltage ................................. 300 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 780 Ω
Peak Grid No. 1 Voltage........................ 156 V
Plate Current (Zero Signal) ................... 80 mA
Plate Current (Maximum Signal) ................ 100 mA
Load Resistance ............................... 5K Ω
Power Output (approx) ......................... 10 W
Total Harmonic Distortion ..................... 5 %

Push Pull Class AB1 Amplifier
Source ........................................ RCA RC-12 - 1934
Plate Voltage ................................. 300 V
Grid No. 1 Voltage ............................ -62 V
Peak Grid No. 1 Voltage........................ 124 V
Plate Current (Zero Signal) ................... 80 mA
Plate Current (Maximum Signal) ................ 147 mA
Load Resistance ............................... 3K Ω
Power Output (approx) ......................... 15 W
Total Harmonic Distortion ..................... 2.5 %

If you are uncertain about the EIA designator for a particular tube please use the "Index" button to list all the tubes in the database. You can click on the designator for the closest tube.

(c) 1994-2021 by William A. Beech, NJ7P

Wed, 08 Feb 2023 23:21:32 -0700