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6AK9
Dissimilar Dual Triode - Pentode

Base & Bulb ( GE DS 11/67)

Mechanical Data

Bulb .......................................... T-12
Base .......................................... E12-74 Button 12-Pin
Outline ....................................... 12-56
EIA Base ...................................... 12GZ
Cathode ....................................... Coated Unipotential
Mounting Position ............................. Any

Electrical Data

Heater Voltage ................................ 6.3 V
Heater Current ................................ 1.6 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 ......................................... 12 pf
Output ........................................ 8.0 pf
Grid to Plate ................................. 0.22 pf

Direct Interelectrode Capacitances (approx)

Triode 1
Input ......................................... 3.2 pf
Output ........................................ 0.56 pf
Grid to Plate ................................. 3.2 pf

Direct Interelectrode Capacitances (approx)

Triode 2
Input ......................................... 2.2 pf
Output ........................................ 0.6 pf
Grid to Plate ................................. 3.6 pf

Maximum Ratings (Design Center Values)

Pentode
Plate Voltage ................................. 350 V
Grid No. 2 Voltage ............................ 250 V
Plate Dissipation ............................. 10 W
Grid No. 2 Dissipation ........................ 2.0 W
Grid No. 1 Circuit Resistance
Fixed Bias .................................. 1M Ω
Self Bias ................................... 2.2M Ω

Maximum Ratings (Design Center Values)

Triode 1
Plate Voltage ................................. 330 V
Positive Grid No. 1 Voltage ................... 0 V
Plate Dissipation ............................. 1.25 W
Grid No. 1 Circuit Resistance
Fixed Bias .................................. 500K Ω

Maximum Ratings (Design Center Values)

Triode 2
Plate Voltage ................................. 330 V
Plate Dissipation ............................. 1.0 W

Characteristics and Typical Operation

Triode 1 Class A Amplifier
Plate Voltage ................................. 150 V
Grid No. 1 Voltage ............................ -2.0 V
Amplification Factor .......................... 43
Plate Resistance (approx) ..................... 11000 Ω
Transconductance .............................. 3900 µ
Plate Current ................................. 5.4 mA
Grid No. 1 Voltage for Ib ..................... 10 µa @ -5.7 V

Characteristics and Typical Operation

Triode 2 Class A Amplifier
Plate Voltage ................................. 150 V
Grid No. 1 Voltage ............................ -5.0 V
Amplification Factor .......................... 20
Plate Resistance (approx) ..................... 8500 Ω
Transconductance .............................. 2350 µ
Plate Current ................................. 5.5 mA
Grid No. 1 Voltage for Ib ..................... 10 µa @ -11 V

Characteristics and Typical Operation

Pentode Class A Amplifier
Plate Voltage ................................. 150 V
Grid No. 2 Voltage ............................ 150 V
Grid No. 1 Voltage ............................ -14 V
Plate Resistance (approx) ..................... 16400 Ω
Transconductance .............................. 6200 µ
Plate Current ................................. 49 mA
Grid No. 2 Current ............................ 3.5 mA
Grid No. 1 Voltage for Ib ..................... 100 µa @ -33 V

Characteristics and Typical Operation

Pentode Vertical Deflection Amplifier
DC Plate Supply Voltage ....................... 350 V
Peak Positive-Pulse Plate Voltage ............. 2500 V
DC Grid No. 2 Voltage ......................... 250 V
Peak Negative-Pulse Grid No. 1 Voltage ........ -150 V
Average Cathode Current ....................... 80 mA
Peak Cathode Current .......................... 245 mA
Plate Dissipation ............................. 10 W
Grid No. 2 Dissipation ........................ 2.0 W

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