NJ7P SQL Tube Database Query

A horizontal ribbon.

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A horizontal ribbon.

1A4T
Remote-Cutoff Tetrode

EIA Base & Outline

EIA Base: 4KEIA Bulb: 12-6

Substitute Data

Preferred Substitutes ......................... 1B4
Substitutes ................................... 1C4 1K4
Source ........................................ ARRL HB - 1947

Application

Source ........................................ ARRL HB - 1947
Glass type used in battery-operated receivers as rf or if amplifier. Requires 4-contact socket.

Source ........................................ ARRL HB - 1947
This type was made as a pentode (1A4P and a tetrode (1A4T). The 1A4 was a pentode.

Mechanical Data

Source ........................................ ARRL HB - 1947
Bulb .......................................... ST-12
EIA Outline ................................... 12-6
EIA Base ...................................... 4K

Electrical Data

Source ........................................ ARRL HB - 1947
Filament Voltage .............................. 2.0 DC V
Filament Current .............................. 0.06 A

Characteristics and Typical Operation

Class A Amplifier
Source ........................................ ARRL HB - 1947
Plate Voltage ................................. 180 V
Grid No. 2 Voltage ............................ 67.5 V
Grid No. 1 Voltage ............................ -3.0 V
Amplification Factor .......................... 720
Plate Resistance (approx) ..................... 960K Ω
Transconductance .............................. 750 µMho
Plate Current ................................. 2.3 mA
Grid No. 2 Current ............................ 0.7 mA

A horizontal ribbon.

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A horizontal ribbon.

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Mon, 05 Dec 2022 02:03:06 -0700