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6FM7
Twin Triode

Base & Bulb ( GE DS 07/63)

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
Base .......................................... E12-70 Button 12-Pin
Outline ....................................... 9-58
EIA Base ...................................... 12EJ
Cathode ....................................... Coated Unipotential
Mounting Position ............................. Any

Electrical Data

Heater Voltage ................................ 6.3 V
Heater Current ................................ 1.05 A
Maximum Heater-Cathode Voltage
Heater Positive with Respect to Cathode
DC Component .............................. 100 V
Total DC and Peak ......................... 200 V
Heater Negative with Respect to Cathode
DC Component .............................. 200 V
Total DC and Peak ......................... 200 V

Direct Interelectrode Capacitances (approx)

Triode 1
Input ......................................... 2.4 pf
Output ........................................ 0.4 pf
Grid to Plate ................................. 4.0 pf

Direct Interelectrode Capacitances (approx)

Triode 2
Input ......................................... 7.0 pf
Output ........................................ 1.1 pf
Grid to Plate ................................. 7.0 pf

Maximum Ratings (Design Center Values)

Triode 1
Plate Voltage ................................. 350 V
Negative Grid No. 1 Voltage ................... -400 V
Plate Dissipation ............................. 1 W
Grid No. 1 Circuit Resistance
Fixed Bias .................................. 1M Ω
Self Bias ................................... 1M Ω

Maximum Ratings (Design Center Values)

Triode 2
Plate Voltage ................................. 500 V
Negative Grid No. 1 Voltage ................... -250 V
Plate Dissipation ............................. 10 W
Cathode Current ............................... 50 mA
Grid No. 1 Circuit Resistance
Fixed Bias .................................. 2.2M Ω
Self Bias ................................... 2.2M Ω

Characteristics and Typical Operation

Triode 1 Vertical Oscillator
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
Grid No. 1 Voltage for Ib ..................... 20 µa @ -5.3 V

Characteristics and Typical Operation

Triode 2 Vertical Amplifier
Plate Voltage ................................. 175 V
Grid No. 1 Voltage ............................ -25 V
Amplification Factor .......................... 5.5
Plate Resistance (approx) ..................... 920 Ω
Transconductance .............................. 6000 µ
Plate Current ................................. 40 mA
Grid No. 1 Voltage for Ib ..................... 200 µa @ -45 V

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