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112A
Low-Mu Triode

EIA Base & Outline

EIA Base: 4DEIA Bulb: 14-0
Source ........................................ RCA R-10 - 1932

Application

Source ........................................ RCA R-10 - 1932
The 112A is an improved storage battery tube. It is sensitive as a detector and excellent as a three-electrode radio-frequency and audio-frequency amplifier.

Mechanical Data

Source ........................................ RCA R-10 - 1932
Bulb .......................................... S-14
Base Type ..................................... Medium 4-Pin
EIA Outline ................................... 14-0
EIA Base ...................................... 4D
Mounting Position ............................. Vertical

Source ........................................ RCA RC-12 - 1934
Bulb .......................................... ST-14
Base Type ..................................... Medium 4-Pin
EIA Outline ................................... 14-1
EIA Base ...................................... 4D
Mounting Position ............................. Vertical

Electrical Data

Source ........................................ RCA R-10 - 1932
Filament Voltage .............................. 5.0 DC V
Filament Current .............................. 0.25 A

Direct Interelectrode Capacitances (approx)

Triode
Source ........................................ RCA R-10 - 1932
Input ......................................... 4.0 pf
Output ........................................ 2.0 pf
Grid to Plate ................................. 8.5 pf

Triode
Source ........................................ RCA RC-12 - 1934
Input ......................................... 4.0 pf
Output ........................................ 2.0 pf
Grid to Plate ................................. 8.5 pf

Maximum Ratings (Design Center Values)

Triode
Source ........................................ RCA R-10 - 1932
Plate Voltage ................................. 180 V
Bulb Temperature (At Hottest Point) ........... °C

Characteristics and Typical Operation

Class A Amplifier
Source ........................................ RCA R-10 - 1932
Plate Voltage ................................. 90 V
Grid No. 1 Voltage ............................ -4.5 V
Amplification Factor .......................... 8.5
Plate Resistance (approx) ..................... 5K Ω
Transconductance .............................. 1575 µMho
Plate Current ................................. 5.0 mA
Load Resistance ............................... 5K Ω
Power Output (approx) ......................... 0.035 W

Class A Amplifier
Source ........................................ RCA R-10 - 1932
Plate Voltage ................................. 135 V
Grid No. 1 Voltage ............................ -9.0 V
Amplification Factor .......................... 8.5
Plate Resistance (approx) ..................... 5.1K Ω
Transconductance .............................. 1650 µMho
Plate Current ................................. 6.2 mA
Load Resistance ............................... 9K Ω
Power Output (approx) ......................... 0.13 W

Class A Amplifier
Source ........................................ RCA R-10 - 1932
Plate Voltage ................................. 180 V
Grid No. 1 Voltage ............................ -13.5 V
Amplification Factor .......................... 8.5
Plate Resistance (approx) ..................... 4.7K Ω
Transconductance .............................. 1800 µMho
Plate Current ................................. 7.7 mA
Load Resistance ............................... 10.65K Ω
Power Output (approx) ......................... 0.285 W

Notes

Source ........................................ RCA RC-15 - 1947
1. Discontinued type!

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Mon, 04 Jul 2022 17:10:00 -0700