NJ7P SQL Tube Database Query

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7L7
Sharp-Cutoff Pentode

EIA Base & Outline

EIA Base: 8VEIA Bulb: 9-30

Substitute Data

Preferred Substitutes ......................... 7G7 7H7
Substitutes ................................... 7A7 7AH7 7T7 7V7
Source ........................................ RCA RC-15 - 1947

Application

Source ........................................ RCA RC-15 - 1947
Glass lock-in type used as rf and if amplifier in radio equipment. Require lock-in socket.

Mechanical Data

Source ........................................ RCA RC-15 - 1947
Bulb .......................................... T-9
Base Type ..................................... Lock-in 8-Pin
EIA Outline ................................... 9-30
EIA Base ...................................... 8V

Electrical Data

Source ........................................ RCA RC-15 - 1947
Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.3 A

Characteristics and Typical Operation

Class A Amplifier
Source ........................................ RCA RC-15 - 1947
Plate Voltage ................................. 100 V
Grid No. 2 Voltage ............................ 100 V
Grid No. 1 Voltage ............................ -1 V
Plate Resistance (approx) ..................... 100K Ω
Transconductance .............................. 3000 µMho
Plate Current ................................. 5.5 mA
Grid No. 2 Current ............................ 2.4 mA

Class A Amplifier
Source ........................................ RCA RC-15 - 1947
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 100 V
Grid No. 1 Voltage ............................ -1.5 V
Plate Resistance (approx) ..................... 1M Ω
Transconductance .............................. 3100 µMho
Plate Current ................................. 4.5 mA
Grid No. 2 Current ............................ 1.5 mA

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Thu, 18 Aug 2022 00:08:22 -0700