NJ7P SQL Tube Database Query

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31
Power Triode

EIA Base & Outline

EIA Base: 4DEIA Bulb: 12-0
Source ........................................ RCA R-10 - 1932

31
Power Triode

EIA Base: 4DEIA Bulb: 12-5
Source ........................................ RCA RC-11 - 1933

Application

Source ........................................ RCA R-10 - 1932
The '31 is a power amplifier of the three-electrode type. It has a coated filament which takes as little power as possible consistent with satisfactory operating performance. This feature makes the '31 particularly suitable in battery-operated radio receivers employing the '30, '32, and/or '34 where economy of filament current drain is important.

Mechanical Data

Source ........................................ RCA R-10 - 1932
Bulb .......................................... S-12
Base Type ..................................... Small 4-Pin
EIA Outline ................................... 12-0
EIA Base ...................................... 4D
Mounting Position ............................. Vertical

Source ........................................ RCA RC-11 - 1933
Bulb .......................................... ST-12
Base Type ..................................... Small 4-Pin
EIA Outline ................................... 12-5
EIA Base ...................................... 4D
Mounting Position ............................. Vertical

Electrical Data

Source ........................................ RCA R-10 - 1932
Filament Voltage .............................. 2.0 DC V
Filament Current .............................. 0.13 A

Direct Interelectrode Capacitances (approx)

Triode
Source ........................................ RCA R-10 - 1932
Input ......................................... 3.7 pf
Output ........................................ 2.2 pf
Grid to Plate ................................. 5.7 pf

Triode
Source ........................................ RCA RC-13 - 1937
Input ......................................... 3.5 pf
Output ........................................ 2.7 pf
Grid to Plate ................................. 5.7 pf

Maximum Ratings (Design Center Values)

Triode
Source ........................................ RCA R-10 - 1932
Plate Voltage ................................. 180 V
Cathode Current ............................... mA
Grid No. 1 Circuit Resistance
Fixed Bias ................................. Ω
Self Bias .................................. Ω
Bulb Temperature (At Hottest Point) ........... °C

Characteristics and Typical Operation

Class A Amplifier
Source ........................................ RCA R-10 - 1932
Plate Voltage ................................. 135 V
Grid No. 1 Voltage ............................ -22.5 V
Amplification Factor .......................... 3.8
Plate Resistance (approx) ..................... 4100 Ω
Transconductance .............................. 925 µMho
Plate Current ................................. 8.0 mA
Load Resistance ............................... 7000 Ω
Power Output (approx) ......................... 0.185 W

Class A Amplifier
Source ........................................ RCA R-10 - 1932
Plate Voltage ................................. 180 V
Grid No. 1 Voltage ............................ -30 V
Amplification Factor .......................... 3.8
Plate Resistance (approx) ..................... 3600 Ω
Transconductance .............................. 1050 µMho
Plate Current ................................. 12.3 mA
Load Resistance ............................... 5700 Ω
Power Output (approx) ......................... 0.375 W

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Fri, 24 Jun 2022 19:13:21 -0700