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6AF11
Twin Triode - Sharp-Cutoff Pentode

Base & Bulb ( GE DS 11/62)

Substitute Data

Preferred Substitutes ......................... 6AS11
Substitutes ................................... 6BD11

Application

Duodecar type used in television receiver applications. The high-mu triode unit is used for agc keyer service, the medium-mu triode unit for sync separator service, and the pentode unit for video amplifier service. Requires duodecar 12-contact socket.

Mechanical Data

Bulb .......................................... T-9
Base .......................................... E12-70 Button 12-Pin
Outline ....................................... 9-58
EIA Base ...................................... 12DP
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)

Pentode
Input ......................................... 10.0 pf
Output ........................................ 4.5 pf
Grid to Plate ................................. 0.12 pf

Direct Interelectrode Capacitances (approx)

Triode 1
Input ......................................... 3.0 pf
Output ........................................ 2.2 pf
Grid to Plate ................................. 1.9 pf

Direct Interelectrode Capacitances (approx)

Triode 2
Input ......................................... 2.4 pf
Output ........................................ 3.8 pf
Grid to Plate ................................. 3.6 pf

Maximum Ratings (Design Center Values)

Pentode
Plate Voltage ................................. 330 V
Grid No. 2 Voltage ............................ 330 V
Positive Grid No. 1 Voltage ................... 0 V
Plate Dissipation ............................. 5 W
Grid No. 2 Dissipation ........................ 1.25 W
Grid No. 1 Circuit Resistance
Fixed Bias .................................. 250K Ω
Self Bias ................................... 1M Ω

Maximum Ratings (Design Center Values)

Triode 1
Plate Voltage ................................. 330 V
Positive Grid No. 1 Voltage ................... 0 V
Plate Dissipation ............................. 1.1 W
Grid No. 1 Circuit Resistance
Fixed Bias .................................. 500K Ω
Self Bias ................................... 1M Ω

Maximum Ratings (Design Center Values)

Triode 2
Plate Voltage ................................. 330 V
Positive Grid No. 1 Voltage ................... 0 V
Plate Dissipation ............................. 2 W
Grid No. 1 Circuit Resistance
Fixed Bias .................................. 500K Ω
Self Bias ................................... 1M Ω

Characteristics and Typical Operation

Triode 1 Class A Amplifier
Plate Voltage ................................. 150 V
Grid No. 1 Voltage ............................ -2.0 V
Amplification Factor .......................... 68
Plate Resistance (approx) ..................... 12.4K Ω
Transconductance .............................. 5500 µ
Plate Current ................................. 7.0 mA
Grid No. 1 Voltage for Ib ..................... 10 µa @ -5.5 V

Characteristics and Typical Operation

Triode 2 Class A Amplifier
Plate Voltage ................................. 200 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ....................... 220 Ω
Amplification Factor .......................... 41
Plate Resistance (approx) ..................... 9400 Ω
Transconductance .............................. 4400 µ
Plate Current ................................. 9.2 mA
Grid No. 1 Voltage for Ib ..................... 100 µa @ -6.5 V

Characteristics and Typical Operation

Pentode Class A Amplifier
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 150 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ....................... 100 Ω
Plate Resistance (approx) ..................... 68K Ω
Transconductance .............................. 11K µ
Plate Current ................................. 24 mA
Grid No. 2 Current ............................ 4.8 mA
Grid No. 1 Voltage for Ib ..................... 100 µa @ -10 V

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