NJ7P SQL Tube Database Query

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7J7
Triode - Heptode Converter

EIA Base & Outline

EIA Base: 8BLEIA Bulb: 9-30

Substitute Data

Preferred Substitutes ......................... 7S7
Source ........................................ RCA RC-15 - 1947

Application

Source ........................................ RCA RC-15 - 1947
Glass lock-in type used as combined oscillator and heptode mixer in radio receivers. Requires 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 ...................................... 8BL

Electrical Data

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

Characteristics and Typical Operation

Triode as Oscillatorillator
Source ........................................ RCA RC-15 - 1947
Plate Voltage ................................. 250 V
Plate Current ................................. 5 mA

Heptode as mixer
Source ........................................ RCA RC-15 - 1947
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 100 V
Grid No. 1 Voltage ............................ -3 V
Plate Resistance (approx) ..................... 1.5M Ω
Transconductance .............................. 290 µMho
Plate Current ................................. 1.4 mA
Grid No. 2 Current ............................ 2.8 mA

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Tue, 09 Aug 2022 06:02:59 -0700