NJ7P SQL Tube Database Query

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6FR7
Medium-Mu Twin Triode

EIA Base & Outline

EIA Base: 9HFEIA Bulb: 9-70

Substitute Data

Preferred Substitutes ......................... 6EW7 6FD7
Substitutes ................................... 6DE7 6DR7
Source ........................................ GE - 1973

Mechanical Data

Source ........................................ GE - 1973
Bulb .......................................... T-9
EIA Outline ................................... 9-70
EIA Base ...................................... 9HF

Electrical Data

Source ........................................ GE - 1973
Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.925 A

Maximum Ratings (Design Center Values)

Triode 1
Source ........................................ GE - 1973
Plate Voltage ................................. 330 V
Plate Dissipation ............................. 1.5 W

Triode 2
Source ........................................ GE - 1973
Plate Voltage ................................. 330 V
Plate Dissipation ............................. 10 W

Characteristics and Typical Operation

Triode 1 Vertical Oscillator
Source ........................................ GE - 1973
Plate Voltage ................................. 250 V
Grid No. 1 Voltage ............................ -3.0 V
Amplification Factor .......................... 68
Plate Resistance (approx) ..................... 40000 Ω
Transconductance .............................. 1600 µMho
Plate Current ................................. 1.4 mA

Triode 2 Vertical Amplifier
Source ........................................ GE - 1973
Plate Voltage ................................. 150 V
Grid No. 1 Voltage ............................ -20.0 V
Amplification Factor .......................... 5.4
Plate Resistance (approx) ..................... 750 Ω
Transconductance .............................. 7200 µMho
Plate Current ................................. 50.0 mA

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Tue, 28 Mar 2023 23:37:58 -0700