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6BF11
Beam Power - Sharp-Cutoff Pentode

Base & Bulb ( GE DS 11/67)

Substitute Data

Substitutes ................................... 6AD10 6T10

Application

Duodecar type used as combined detector and amplifier tube in color and black-and-white television receivers. Requires duodecar 12-contact socket.The dual-control, sharp-cutoff pentode unit is used as an FM detector and the beam power unit as an af output amplifier.

Mechanical Data

Bulb .......................................... T-9
Base .......................................... E12-70 Button 12-Pin
Outline ....................................... 9-59
EIA Base ...................................... 12EZ
Cathode ....................................... Coated Unipotential
Mounting Position ............................. Any

Electrical Data

Heater Voltage ................................ 6.3 V
Heater Current ................................ 1.2 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)

Beam Pentode
Input ......................................... 13 pf
Output ........................................ 10 pf
Grid to Plate ................................. 0.24 pf

Direct Interelectrode Capacitances (approx)

Dual-Control Pentode
Grid No. 1 to Plate ........................... 0.036 pf
Grid No. 3 to Plate ........................... 3.2 pf
Grid No. 1 to All Except Plate (Input) ........ 6.5 pf
Grid No. 3 to All (Input) ..................... 8.0 pf
Grid No. 1 to Grid No. 3 ...................... 0.11 pf

Maximum Ratings (Design Center Values)

Beam Pentode
Plate Voltage ................................. 165 V
Grid No. 2 Voltage ............................ 150 V
Plate Dissipation ............................. 6.5 W
Grid No. 2 Dissipation ........................ 1.8 W
Cathode Current ............................... 65 mA
Grid No. 1 Circuit Resistance
Fixed Bias .................................. 250K Ω
Self Bias ................................... 500K Ω

Maximum Ratings (Design Center Values)

Dual-Control Pentode
Plate Voltage ................................. 330 V
Positive Grid No. 3 Voltage ................... 28 V
Grid No. 2 Supply Voltage ..................... 330 V
Grid No. 2 Voltage ............................ See Chart V
Positive Grid No. 1 Voltage ................... 0 V
Plate Dissipation ............................. 1.7 W
Grid No. 2 Dissipation ........................ 1.1 W

Characteristics and Typical Operation

Beam Class A Amplifier
Plate Voltage ................................. 145 V
Grid No. 2 Voltage ............................ 110 V
Grid No. 1 Voltage ............................ -6 V
Peak Grid No. 1 Voltage........................ 6 V
Plate Resistance (approx) ..................... 30K Ω
Transconductance .............................. 8600 µ
Plate Current (Zero Signal) ................... 36 mA
Plate Current (Maximum Signal) ................ 40 mA
Grid No. 2 Current (Zero Signal) .............. 3 mA
Grid No. 2 Current (Maximum Signal) ........... 9 mA
Load Resistance ............................... 30K Ω
Power Output (approx) ......................... 2.4 W
Total Harmonic Distortion ..................... 10 %

Characteristics and Typical Operation

FM Detector
Plate Voltage ................................. 150 V
Grid No. 3 Voltage ............................ 0 V
Grid No. 2 Voltage ............................ 100 V
Grid No. 1 Voltage Derived From
Cathode Bias Resistor ....................... 560 Ω
Plate Resistance (approx) ..................... 150K Ω
Grid No. 1 Transconductance ................... 1000 µ
Grid No. 3 Transconductance ................... 400 µ
Plate Current ................................. 1.3 mA
Grid No. 2 Current ............................ 2.0 mA
Grid No. 1 Voltage for Ib ..................... 10 µa @ -4.5 V
Grid No. 3 Voltage for Ib ..................... 10 µa @ -4.5 V

Characteristic Curves

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