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6AL9
Medium-Mu Triode - Pentode

Base & Bulb ( GE - 1973)

Substitute Data

Preferred Substitutes ......................... 6AG9

Mechanical Data

Bulb .......................................... T-9
Outline ....................................... 9-59
EIA Base ...................................... 12HE

Electrical Data

Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.82 A

Maximum Ratings (Design Center Values)

Pentode
Plate Voltage ................................. 330 V
Grid No. 2 Voltage ............................ 200 V
Plate Dissipation ............................. 10 W
Grid No. 2 Dissipation ........................ 1.5 W

Maximum Ratings (Design Center Values)

Triode
Plate Voltage ................................. 330 V
Plate Dissipation ............................. 1.5 W

Characteristics and Typical Operation

Triode Class A Amplifier
Plate Voltage ................................. 200 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ....................... 270 Ω
Amplification Factor .......................... 59
Plate Resistance (approx) ..................... 9200 Ω
Transconductance .............................. 6300 µ
Plate Current ................................. 7.6 mA

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) ..................... 40000 Ω
Transconductance .............................. 30000 µ
Plate Current ................................. 28 mA
Grid No. 2 Current ............................ 5.6 mA

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