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1B4
Sharp-Cutoff Pentode

EIA Base & Outline

EIA Base: 4MEIA Bulb: 12-6
Source ........................................ RCA RC-13 - 1937

Application

Source ........................................ RCA RC-13 - 1937
Glass type used as rf amplifier or detector in battery-operated receivers. Requires four-contact socket.

Source ........................................ RCA RC-13 - 1937
This type was made as a pentode (1B4P and a tetrode (1B4T). The 1B4 was a pentode.

Mechanical Data

Source ........................................ RCA RC-13 - 1937
Bulb .......................................... ST-12
Base Type ..................................... Small 4-Pin
EIA Outline ................................... 12-6
EIA Base ...................................... 4M
Top Cap ....................................... Small Metal
Mounting Position ............................. Any

Electrical Data

Source ........................................ RCA RC-13 - 1937
Filament Voltage .............................. 2.0 DC V
Filament Current .............................. 0.06 A

Direct Interelectrode Capacitances (approx)

Pentode
Source ........................................ RCA RC-13 - 1937
Input ......................................... 5.0 pf
Output ........................................ 11.0 pf
Grid to Plate ................................. 0.007 pf

Maximum Ratings (Design Center Values)

Pentode
Source ........................................ RCA RC-13 - 1937
Plate Voltage ................................. 180 V
Grid No. 2 Voltage ............................ 67.5 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 RC-13 - 1937
Plate Voltage ................................. 180 V
Grid No. 2 Voltage ............................ 67.5 V
Grid No. 1 Voltage ............................ -3 V
Amplification Factor .......................... 1000
Plate Resistance (approx) ..................... 1.5M Ω
Transconductance .............................. 650 µMho
Plate Current ................................. 1.7 mA
Grid No. 2 Current ............................ 0.6 mA
Grid No. 1 Voltage for Ib ..................... 0 µa @ -8 V

Class A Amplifier
Source ........................................ RCA RC-13 - 1937
Plate Voltage ................................. 90 V
Grid No. 2 Voltage ............................ 67.5 V
Grid No. 1 Voltage ............................ -3 V
Amplification Factor .......................... 550
Plate Resistance (approx) ..................... 1M Ω
Transconductance .............................. 600 µMho
Plate Current ................................. 1.6 mA
Grid No. 2 Current ............................ 0.7 mA
Grid No. 1 Voltage for Ib ..................... 0 µa @ -8 V

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Sat, 25 Jun 2022 16:07:18 -0700