6AF11 — Compound (multi-section), Compactron | TubeofileKnown Equivalents & Substitutes
Similar Tubes (Not Drop-In Compatible)
6AF9
Similar Compactron triode-pentode compound but with different section configuration and ratingsElectrical Specifications
Section 1 — Triode No.1 (High-Mu)
Absolute Maximum
Anode Voltage (max)Plate Voltage (max)330V
Anode Dissipation (max)Plate Dissipation (max)1.1W
Heater-to-Cathode Voltage (max)Heater-Cathode Voltage (max, DC)100V
Max Grid ResistorMax Grid Resistor (cathode bias)1MΩ
Typical Operating
Anode Voltage (typical)Plate Voltage200V
Grid 1 Bias VoltageGrid Voltage-2V
Anode CurrentPlate Current7mA
Anode ResistancePlate Resistance12,400Ω
TransconductanceTransconductance
Capacitances
Grid-to-Plate CapacitanceGrid-to-Plate Capacitance1.9pF
Input CapacitanceInput Capacitance3pF
Output CapacitanceOutput Capacitance2.2pF
Section 2 — Triode No.2 (Medium-Mu)
Absolute Maximum
Anode Voltage (max)Plate Voltage (max)330V
Anode Dissipation (max)Plate Dissipation (max)1.1W
Heater-to-Cathode Voltage (max)Heater-Cathode Voltage (max, DC)100V
Max Grid ResistorMax Grid Resistor (cathode bias)1MΩ
Section 3 — Pentode
Absolute Maximum
Anode Voltage (max)Plate Voltage (max)330V
Screen Voltage (max)Screen Voltage (max)330V
Anode Dissipation (max)Plate Dissipation (max)2W
Screen Dissipation (max)Screen Dissipation (max)5W
Heater-to-Cathode Voltage (max)Heater-Cathode Voltage (max, DC)
Heater
Heater VoltageHeater Voltage6.3V
Heater CurrentHeater Current1.05A
Notes
- Triode Unit No.1 is the high-mu section (mu=68), Triode Unit No.2 is the medium-mu section (mu=41).
- The pentode section shares a common cathode with the pentode grid No.3 (suppressor) internally connected to cathode.
- Pin 9 is the pentode cathode and also the pentode grid No.3 and internal shield connection.
- Maximum grid-circuit resistance (fixed bias): pentode 0.25 MO, triode 0.5 MO. Cathode bias: pentode 1 MO, triode 1 MO.
- Interelectrode capacitance from pentode plate to triode No.2 plate is 0.045 pF max, triode No.1 to triode No.2 plate is 0.06 pF max.
5.5mA/V
Amplification Factor (μ)Amplification Factor68—
Anode Voltage (typical)Plate Voltage
200V
Grid 1 Bias VoltageGrid Voltage-2V
Anode CurrentPlate Current9.2mA
Anode ResistancePlate Resistance9,400Ω
TransconductanceTransconductance4.4mA/V
Amplification Factor (μ)Amplification Factor41—
Capacitances
Grid-to-Plate CapacitanceGrid-to-Plate Capacitance3.6pF
Input CapacitanceInput Capacitance2.4pF
Output CapacitanceOutput Capacitance3.8pF
100V
Max Grid ResistorMax Grid Resistor (cathode bias)1MΩ
Typical Operating
Anode Voltage (typical)Plate Voltage200V
Screen Voltage (typical)Screen Voltage150V
Grid 1 Bias VoltageGrid Voltage0V
Anode CurrentPlate Current55mA
Screen CurrentScreen Current24mA
Anode ResistancePlate Resistance68,000Ω
TransconductanceTransconductance11mA/V
Capacitances
Grid-to-Plate CapacitanceGrid No.1 to Plate Capacitance0.12pF
Input CapacitanceInput Capacitance10pF
Output CapacitanceOutput Capacitance4.5pF
Pentode Plate
3Grid of Triode Unit No.2
4Plate of Triode Unit No.2
5Cathode of Triode Unit No.1
6Grid of Triode Unit No.1
7Cathode of Triode Unit No.2,Internal Shield
8Plate of Triode Unit No.1
9Pentode Cathode,Pentode Grid No.3,Internal Shield
10Pentode Screen Grid (Grid No.2)
11Pentode Control Grid (Grid No.1)