NJ7P SQL Tube Database Query

A horizontal ribbon.

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A horizontal ribbon.

3S4
Power Pentode

EIA Base & Outline

EIA Base: 7BAEIA Bulb: 5-2

Substitute Data

Preferred Substitutes ......................... 3Q4 3W4
Substitutes ................................... 3Z4
Source ........................................ RCA RC-15 - 1947

Application

Source ........................................ RCA RC-15 - 1947
Miniature type used in output stage of lightweight, compact, portable, battery-operated equipment. Requires miniature 7-contact socket. Except for filament arrangement, it is identical to 1S4.

Mechanical Data

Source ........................................ RCA RC-15 - 1947
Bulb .......................................... T-5 1/2
Base Type ..................................... Miniature Button 7-Pin
EIA Outline ................................... 5-2
EIA Base ...................................... 7BA
Mounting Position ............................. Any

Electrical Data

Source ........................................ RCA RC-15 - 1947
Heater Voltage ................................ 2.8/1.4 DC V
Heater Current ................................ 0.05/0.1 A

Characteristics and Typical Operation

Class A Amplifier (2.8V)
Source ........................................ RCA RC-15 - 1947
Plate Voltage ................................. 90 V
Grid No. 2 Voltage ............................ 67.5 V
Grid No. 1 Voltage ............................ -7 V
Plate Resistance (approx) ..................... 100K Ω
Transconductance .............................. 1425 µMho
Plate Current ................................. 6.1 mA
Grid No. 2 Current ............................ 1.1 mA
Load Resistance ............................... 8K Ω
Power Output (approx) ......................... 0.235 W

Class A Amplifier (2.8V)
Source ........................................ RCA RC-15 - 1947
Plate Voltage ................................. 67.5 V
Grid No. 2 Voltage ............................ 67.5 V
Grid No. 1 Voltage ............................ -7 V
Plate Resistance (approx) ..................... 100K Ω
Transconductance .............................. 1400 µMho
Plate Current ................................. 6.0 mA
Grid No. 2 Current ............................ 1.2 mA
Load Resistance ............................... 5K Ω
Power Output (approx) ......................... 0.16 W

Class A Amplifier (1.4V)
Source ........................................ RCA RC-15 - 1947
Plate Voltage ................................. 90 V
Grid No. 2 Voltage ............................ 67.5 V
Grid No. 1 Voltage ............................ -7 V
Plate Resistance (approx) ..................... 100K Ω
Transconductance .............................. 1575 µMho
Plate Current ................................. 7.4 mA
Grid No. 2 Current ............................ 1.4 mA
Load Resistance ............................... 8K Ω
Power Output (approx) ......................... 0.27 W

Class A Amplifier (1.4V)
Source ........................................ RCA RC-15 - 1947
Plate Voltage ................................. 67.5 V
Grid No. 2 Voltage ............................ 67.5 V
Grid No. 1 Voltage ............................ -7 V
Plate Resistance (approx) ..................... 100K Ω
Transconductance .............................. 1550 µMho
Plate Current ................................. 7.2 mA
Grid No. 2 Current ............................ 1.5 mA
Load Resistance ............................... 5K Ω
Power Output (approx) ......................... 0.18 W

A horizontal ribbon.

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A horizontal ribbon.

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Thu, 18 Aug 2022 19:31:57 -0700