NJ7P SQL Tube Database Query

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6JL8
Medium-Mu Triode - Pentode

EIA Base & Outline

EIA Base: 9DXEIA Bulb: 6-3

Substitute Data

Preferred Substitutes ......................... 6CX8
Substitutes ................................... 6EB8 6GN8 6JE8 6KR8 6LB8 6LY8
Source ........................................ GE - 1973

Mechanical Data

Source ........................................ GE - 1973
Bulb .......................................... T-6 1/2
EIA Outline ................................... 6-3
EIA Base ...................................... 9DX

Electrical Data

Source ........................................ GE - 1973
Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.75 A

Maximum Ratings (Design Center Values)

Pentode
Source ........................................ GE - 1973
Plate Voltage ................................. 330 V
Grid No. 2 Voltage ............................ 175 V
Plate Dissipation ............................. 5.0 W
Grid No. 2 Dissipation ........................ 1.1 W

Triode
Source ........................................ GE - 1973
Plate Voltage ................................. 330 V
Plate Dissipation ............................. 2.0 W

Characteristics and Typical Operation

Pentode Class A Amplifier
Source ........................................ GE - 1973
Plate Voltage ................................. 300 V
Grid No. 2 Voltage ............................ 150 V
Grid No. 1 Voltage ............................ -3.5 V
Plate Resistance (approx) ..................... 60000 Ω
Transconductance .............................. 11500 µMho
Plate Current ................................. 25 mA
Grid No. 2 Current ............................ 5.0 mA
Load Resistance ............................... 5K Ω
Power Output (approx) ......................... 1.8 W

Triode Class A Amplifier
Source ........................................ GE - 1973
Plate Voltage ................................. 150 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 150 Ω
Amplification Factor .......................... 35
Plate Resistance (approx) ..................... 7500 Ω
Transconductance .............................. 4700 µMho
Plate Current ................................. 10 mA

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Fri, 30 Sep 2022 06:48:01 -0700