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6AS11
High-Mu Twin Triode - Sharp-Cutoff Pentode

Base & Bulb ( RCA DS 1/63)

Substitute Data

Preferred Substitutes ......................... 6AF11
Substitutes ................................... 6BD11

Mechanical Data

Bulb .......................................... T-9
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
Total DC and Peak ......................... 200 V

Direct Interelectrode Capacitances (approx)

Pentode
Input ......................................... 9.5 pf
Output ........................................ 4.4 pf
Grid to Plate ................................. 0.11 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
Plate Dissipation ............................. 5.0 W
Grid No. 2 Dissipation ........................ 1.1 W
Grid No. 1 Circuit Resistance
Fixed Bias .................................. 0.25M Ω
Self Bias ................................... 1M Ω

Maximum Ratings (Design Center Values)

Triode 1
Plate Voltage ................................. 330 V
Plate Dissipation ............................. 1.5 W
Grid No. 1 Circuit Resistance
Fixed Bias .................................. 0.5M Ω
Self Bias ................................... 1M Ω

Maximum Ratings (Design Center Values)

Triode 2
Plate Voltage ................................. 330 V
Plate Dissipation ............................. 2.0 W
Grid No. 1 Circuit Resistance
Fixed Bias .................................. 0.5M Ω
Self Bias ................................... 1M Ω

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

Triode 1 Class A Amplifier
Plate Voltage ................................. 200 V
Grid No. 1 Voltage ............................ -2 V
Amplification Factor .......................... 68
Plate Resistance (approx) ..................... 12400 Ω
Transconductance .............................. 5500 µ
Plate Current ................................. 7 mA
Grid No. 1 Voltage for Ib ..................... 10 µa @ -5.5 V

Characteristics and Typical Operation

Pentode Class A Amplifier
Plate Voltage ................................. 200 V
Grid No. 2 Voltage ............................ 125 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ....................... 68 Ω
Plate Resistance (approx) ..................... 70K Ω
Transconductance .............................. 10500 µ
Plate Current ................................. 24 mA
Grid No. 2 Current ............................ 5.2 mA
Grid No. 1 Voltage for Ib ..................... 100 µa @ -8.0 V

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