NJ7P SQL Tube Database Query

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1A4
Remote-Cutoff Pentode

EIA Base & Outline

Application

Source ........................................ RCA RC-13 - 1937
Glass type used in battery-operated receivers as rf or if amplifier. Requires 4-contact socket.

Source ........................................ RCA RC-13 - 1937
This type was made as a pentode (1A4P and a tetrode (1A4T). The 1A4 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

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 pf
Output ........................................ 11 pf
Grid to Plate ................................. 0.007 pf

Characteristics and Typical Operation

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 .......................... 425
Plate Resistance (approx) ..................... 600K Ω
Transconductance .............................. 720 µ
Plate Current ................................. 2.2 mA
Grid No. 2 Current ............................ 0.9 mA

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 .......................... 750
Plate Resistance (approx) ..................... 1M Ω
Transconductance .............................. 750 µ
Plate Current ................................. 2.3 mA
Grid No. 2 Current ............................ 0.8 mA

If you are uncertain about the EIA designator for a particular tube please use the "Index" button to list all the tubes in the database. You can click on the designator for the closest tube.

(c) 1994-2021 by William A. Beech, NJ7P

Sat, 25 Mar 2023 20:40:09 -0700