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6FJ7
Medium-Mu Twin Triode

Base & Bulb ( GE - 1973)

Application

Duodecar type used as combined vertical-deflection oscillator and vertical-deflection amplifier in color and black-and-white television receivers.Triode unit 1 is used as an oscillator, and triode unit 2 is used as an amplifier. Requires duodecar 12-contact socket.

Mechanical Data

Bulb .......................................... T-9
Outline ....................................... 9-58
EIA Base ...................................... 12BM

Electrical Data

Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.9 A

Direct Interelectrode Capacitances (approx)

Triode 1
Input ......................................... 2.2 pf
Output ........................................ 0.48 pf
Grid to Plate ................................. 3.8 pf

Direct Interelectrode Capacitances (approx)

Triode 2
Input ......................................... 4 pf
Output ........................................ 0.54 pf
Grid to Plate ................................. 5 pf

Maximum Ratings (Design Center Values)

Triode 1
Plate Voltage ................................. 350 V
Plate Dissipation ............................. 1.0 W

Maximum Ratings (Design Center Values)

Triode 2
Plate Voltage ................................. 550 V
Plate Dissipation ............................. 10 W

Characteristics and Typical Operation

Triode 1 Class A Amplifier
Plate Voltage ................................. 250 V
Grid No. 1 Voltage ............................ -3 V
Amplification Factor .......................... 66
Plate Resistance (approx) ..................... 30K Ω
Transconductance .............................. 2200 µ
Plate Current ................................. 2 mA

Characteristics and Typical Operation

Triode 2 Class A Amplifier
Plate Voltage ................................. 250 V
Grid No. 1 Voltage ............................ -25 V
Amplification Factor .......................... 5.5
Plate Resistance (approx) ..................... 920 Ω
Transconductance .............................. 6000 µ
Plate Current ................................. 40 mA

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