NJ7P SQL Tube Database Query

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1B4T
Sharp-Cutoff Tetrode

EIA Base & Outline

EIA Base: 4KEIA Bulb: 12-6

Substitute Data

Preferred Substitutes ......................... 1B4

Application

Glass type used as rf amplifier or detector in battery-operated receivers. Requires four-contact socket.

This type was made as a pentode (1B4P and a tetrode (1B4T). The 1B4 was a pentode.

Mechanical Data

Bulb .......................................... ST-12
EIA Outline ................................... 12-6
EIA Base ...................................... 4K

Electrical Data

Heater Voltage ................................ 2.0 DC V
Heater Current ................................ 0.06 A

Maximum Ratings (Design Center Values)

Tetrode
Plate Voltage ................................. 180 V
Grid No. 2 Voltage ............................ 67.5 V
Negative Grid No. 1 Voltage ................... V
Positive Grid No. 1 Voltage ................... V
Plate Input ................................... W
Plate Dissipation ............................. W
Grid No. 2 Dissipation ........................ W
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
Plate Voltage ................................. 180 V
Grid No. 2 Voltage ............................ 67.5 V
Grid No. 1 Voltage ............................ -3 V
Amplification Factor .......................... 720
Plate Resistance (approx) ..................... 960K Ω
Transconductance .............................. 750 µMho
Plate Current ................................. 1.6 mA
Grid No. 2 Current ............................ 0.7 mA

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Tue, 24 May 2022 02:41:26 -0700