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6AG9
Medium-Mu Triode - Sharp-Cutoff Pentode

Base & Bulb ( GE DS 1/67)

Substitute Data

Preferred Substitutes ......................... 6AL9

Application

Duodecar type with frame grid pentode unit used in television receiver applications. The pentode unit is used as a video amplifier; the triode unit as an agc amplifier. Requires duodecar 12-contact socket.

Mechanical Data

Bulb .......................................... T-9
Base .......................................... E12 Button 12-pin
Outline ....................................... 9-59
EIA Base ...................................... 12HE
Cathode ....................................... Coated Unipotential
Mounting Position ............................. Any

Electrical Data

Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.82 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
Input ......................................... 3.6 pf
Output ........................................ 2.2 pf
Grid to Plate ................................. 2.8 pf

Direct Interelectrode Capacitances (approx)

Pentode
Input ......................................... 17 pf
Output ........................................ 6.5 pf
Grid to Plate ................................. 0.16 pf

Maximum Ratings (Design Center Values)

Pentode
Plate Voltage ................................. 330 V
Grid No. 2 Voltage ............................ 200 V
Positive Grid No. 1 Voltage ................... 0 V
Plate Dissipation ............................. 10 W
Grid No. 2 Dissipation ........................ 1.5 W
Grid No. 1 Circuit Resistance
Fixed Bias .................................. 100K Ω
Self Bias ................................... 250K Ω

Maximum Ratings (Design Center Values)

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

Characteristics and Typical Operation

Triode Class A Amplifier
Plate Voltage ................................. 150 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ....................... 350 Ω
Amplification Factor .......................... 39
Plate Resistance (approx) ..................... 8500 Ω
Transconductance .............................. 4600 µ
Plate Current ................................. 6.2 mA
Grid No. 1 Voltage for Ib ..................... 20 µa @ -7 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 ....................... 56 Ω
Plate Resistance (approx) ..................... 40K Ω
Transconductance .............................. 30K µ
Plate Current ................................. 28 mA
Grid No. 2 Current ............................ 5.6 mA
Grid No. 1 Voltage for Ib ..................... 100 µa @ -5.4 V

Characteristics and Typical Operation

Pentode Class A Amplifier
Plate Voltage ................................. 55 V
Grid No. 2 Voltage ............................ 125 V
Grid No. 1 Voltage ............................ 0 V
Plate Current ................................. 56 mA
Grid No. 2 Current ............................ 21 mA

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