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6L6
Beam Power Pentode
Base & Bulb ( RCA RC-13 - 1937)
Substitute Data
Preferred Substitutes ......................... 5881
Substitutes ................................... 7581
Application
Metal type used in the output stage of audio amplifying equipment, especially units designed to have ample reserve of power-delivering ability. Requires octal socket. This tube, like other power-handling tubes, should be adequately ventilated.
Mechanical Data
Bulb .......................................... MT-10
Base .......................................... Small Wafer Octal
Outline ....................................... 10-1
EIA Base ...................................... 7AC
Mounting Position ............................. Any
Electrical Data
Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.9 A
Maximum Heater-Cathode Voltage
Heater Positive with Respect to Cathode
DC Component .............................. 180 V
Heater Negative with Respect to Cathode
DC Component .............................. 180 V
Direct Interelectrode Capacitances (approx)
Pentode
Input ......................................... 10 pf
Output ........................................ 12 pf
Grid to Plate ................................. 0.4 pf
Maximum Ratings (Design Center Values)
Pentode
Plate Voltage ................................. 375 V
Grid No. 2 Voltage ............................ 250 V
Plate Dissipation ............................. 20.5 W
Grid No. 2 Dissipation ........................ 3.5 W
Characteristics and Typical Operation
Class A Amplifier
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 250 V
Grid No. 1 Voltage ............................ -14 V
Peak Grid No. 1 Voltage........................ 14 V
Amplification Factor .......................... 135
Plate Resistance (approx) ..................... 22.5K Ω
Transconductance .............................. 6000 µ
Plate Current (Zero Signal) ................... 72 mA
Plate Current (Maximum Signal) ................ 79 mA
Grid No. 2 Current (Zero Signal) .............. 5 mA
Grid No. 2 Current (Maximum Signal) ........... 7.3 mA
Load Resistance ............................... 2.5K Ω
Power Output (approx) ......................... 6.5 W
Total Harmonic Distortion ..................... 10 %
Characteristics and Typical Operation
Class A Amplifier (Self bias)
Plate Voltage ................................. 375 V
Grid No. 2 Voltage ............................ 125 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ....................... 365 Ω
Peak Grid No. 1 Voltage........................ 8.5 V
Plate Current (Zero Signal) ................... 24 mA
Plate Current (Maximum Signal) ................ 24.3 mA
Grid No. 2 Current (Zero Signal) .............. 0.7 mA
Grid No. 2 Current (Maximum Signal) ........... 1.8 mA
Load Resistance ............................... 14K Ω
Power Output (approx) ......................... 4 W
Total Harmonic Distortion ..................... 9 %
Characteristics and Typical Operation
Class A Amplifier (Self bias)
Plate Voltage ................................. 300 V
Grid No. 2 Voltage ............................ 200 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ....................... 220 Ω
Peak Grid No. 1 Voltage........................ 12.5 V
Plate Current (Zero Signal) ................... 51 mA
Plate Current (Maximum Signal) ................ 54.5 mA
Grid No. 2 Current (Zero Signal) .............. 3 mA
Grid No. 2 Current (Maximum Signal) ........... 4.6 mA
Load Resistance ............................... 4.5K Ω
Power Output (approx) ......................... 6.5 W
Total Harmonic Distortion ..................... 11 %
Characteristics and Typical Operation
Class A Amplifier (Self bias)
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 250 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ....................... 170 Ω
Peak Grid No. 1 Voltage........................ 14 V
Plate Current (Zero Signal) ................... 75 mA
Plate Current (Maximum Signal) ................ 78 mA
Grid No. 2 Current (Zero Signal) .............. 5.4 mA
Grid No. 2 Current (Maximum Signal) ........... 7.2 mA
Load Resistance ............................... 2.5K Ω
Power Output (approx) ......................... 6.5 W
Total Harmonic Distortion ..................... 10 %
Characteristics and Typical Operation
Class A Amplifier (Fixed bias)
Plate Voltage ................................. 375 V
Grid No. 2 Voltage ............................ 125 V
Grid No. 1 Voltage ............................ -9.0 V
Peak Grid No. 1 Voltage........................ 8 V
Plate Current (Zero Signal) ................... 24 mA
Plate Current (Maximum Signal) ................ 26 mA
Grid No. 2 Current (Zero Signal) .............. 0.7 mA
Grid No. 2 Current (Maximum Signal) ........... 2.0 mA
Load Resistance ............................... 14K Ω
Power Output (approx) ......................... 4.2 W
Total Harmonic Distortion ..................... 9 %
Characteristics and Typical Operation
Class A Amplifier (Fixed bias)
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 250 V
Grid No. 1 Voltage ............................ -14 V
Peak Grid No. 1 Voltage........................ 14 V
Plate Current (Zero Signal) ................... 72 mA
Plate Current (Maximum Signal) ................ 79 mA
Grid No. 2 Current (Zero Signal) .............. 5 mA
Grid No. 2 Current (Maximum Signal) ........... 7.3 mA
Load Resistance ............................... 2.5K Ω
Power Output (approx) ......................... 6.5 W
Total Harmonic Distortion ..................... 10 %
Characteristics and Typical Operation
Class A Amplifier (Fixed bias)
Plate Voltage ................................. 300 V
Grid No. 2 Voltage ............................ 200 V
Grid No. 1 Voltage ............................ -12.5 V
Peak Grid No. 1 Voltage........................ 12.5 V
Plate Resistance (approx) ..................... 35K Ω
Transconductance .............................. 5300 µ
Plate Current (Zero Signal) ................... 48 mA
Plate Current (Maximum Signal) ................ 55 mA
Grid No. 2 Current (Zero Signal) .............. 2.5 mA
Grid No. 2 Current (Maximum Signal) ........... 4.7 mA
Load Resistance ............................... 4.5K Ω
Power Output (approx) ......................... 6.5 W
Total Harmonic Distortion ..................... 11 %
Characteristics and Typical Operation
Class A Amplifier (Fixed bias)
Plate Voltage ................................. 375 V
Grid No. 2 Voltage ............................ 250 V
Grid No. 1 Voltage ............................ -17.5 V
Peak Grid No. 1 Voltage........................ 17.5 V
Plate Current (Zero Signal) ................... 57 mA
Plate Current (Maximum Signal) ................ 67 mA
Grid No. 2 Current (Zero Signal) .............. 2.5 mA
Grid No. 2 Current (Maximum Signal) ........... 6.0 mA
Load Resistance ............................... 4K Ω
Power Output (approx) ......................... 11.5 W
Total Harmonic Distortion ..................... 14.5 %
Characteristics and Typical Operation
Push Pull Class A Amplifier (Fixed bias)
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 250 V
Grid No. 1 Voltage ............................ -16 V
Peak Grid No. 1 Voltage........................ 32 V
Plate Resistance (approx) ..................... 24.5K Ω
Transconductance .............................. 5500 µ
Plate Current (Zero Signal) ................... 120 mA
Plate Current (Maximum Signal) ................ 140 mA
Grid No. 2 Current (Zero Signal) .............. 10 mA
Grid No. 2 Current (Maximum Signal) ........... 16 mA
Load Resistance ............................... 5K Ω
Power Output (approx) ......................... 14.5 W
Total Harmonic Distortion ..................... 2 %
Characteristics and Typical Operation
Push Pull Class A Amplifier (Fixed bias)
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 250 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ....................... 125 Ω
Peak Grid No. 1 Voltage........................ 35.6 V
Plate Current (Zero Signal) ................... 120 mA
Plate Current (Maximum Signal) ................ 130 mA
Grid No. 2 Current (Zero Signal) .............. 10 mA
Grid No. 2 Current (Maximum Signal) ........... 15 mA
Load Resistance ............................... 5K Ω
Power Output (approx) ......................... 13.8 W
Total Harmonic Distortion ..................... 2 %
Characteristics and Typical Operation
Push Pull Class AB1 Amplifier (Self bias)
Plate Voltage ................................. 400 V
Grid No. 2 Voltage ............................ 250 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ....................... 190 Ω
Peak Grid No. 1 Voltage........................ 43.8 V
Plate Current (Zero Signal) ................... 96 mA
Plate Current (Maximum Signal) ................ 110 mA
Grid No. 2 Current (Zero Signal) .............. 4.6 mA
Grid No. 2 Current (Maximum Signal) ........... 10.8 mA
Load Resistance ............................... 8.5K Ω
Power Output (approx) ......................... 24 W
Total Harmonic Distortion ..................... 2 %
Characteristics and Typical Operation
Push Pull Class AB1 Amplifier (Self bias)
Plate Voltage ................................. 400 V
Grid No. 2 Voltage ............................ 300 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ....................... 200 Ω
Peak Grid No. 1 Voltage........................ 57 V
Plate Current (Zero Signal) ................... 112 mA
Plate Current (Maximum Signal) ................ 128 mA
Grid No. 2 Current (Zero Signal) .............. 7 mA
Grid No. 2 Current (Maximum Signal) ........... 16 mA
Load Resistance ............................... 6.6K Ω
Power Output (approx) ......................... 32 W
Total Harmonic Distortion ..................... 2 %
Characteristics and Typical Operation
Push Pull Class AB1 Amplifier (Self bias)
Plate Voltage ................................. 400 V
Grid No. 2 Voltage ............................ 250 V
Grid No. 1 Voltage ............................ -20 V
Peak Grid No. 1 Voltage........................ 40 V
Plate Current (Zero Signal) ................... 88 mA
Plate Current (Maximum Signal) ................ 124 mA
Grid No. 2 Current (Zero Signal) .............. 4 mA
Grid No. 2 Current (Maximum Signal) ........... 12 mA
Load Resistance ............................... 8.5K Ω
Power Output (approx) ......................... 26.5 W
Total Harmonic Distortion ..................... 2 %
Characteristics and Typical Operation
Push Pull Class AB1 Amplifier (Self bias)
Plate Voltage ................................. 400 V
Grid No. 2 Voltage ............................ 300 V
Grid No. 1 Voltage ............................ -25 V
Peak Grid No. 1 Voltage........................ 50 V
Plate Current (Zero Signal) ................... 102 mA
Plate Current (Maximum Signal) ................ 152 mA
Grid No. 2 Current (Zero Signal) .............. 6 mA
Grid No. 2 Current (Maximum Signal) ........... 17 mA
Load Resistance ............................... 6.6K Ω
Power Output (approx) ......................... 34 W
Total Harmonic Distortion ..................... 2 %
Characteristics and Typical Operation
Push Pull Class AB2 Amplifier (Fixed bias)
Plate Voltage ................................. 400 V
Grid No. 2 Voltage ............................ 250 V
Grid No. 1 Voltage ............................ -20 V
Peak Grid No. 1 Voltage........................ 57 V
Plate Current (Zero Signal) ................... 88 mA
Plate Current (Maximum Signal) ................ 168 mA
Grid No. 2 Current (Zero Signal) .............. 4 mA
Grid No. 2 Current (Maximum Signal) ........... 13 mA
Driving Power ................................. 0.18 W
Load Resistance ............................... 6K Ω
Power Output (approx) ......................... 40 W
Characteristics and Typical Operation
Push Pull Class AB2 Amplifier (Fixed bias)
Plate Voltage ................................. 400 V
Grid No. 2 Voltage ............................ 300 V
Grid No. 1 Voltage ............................ 025 V
Peak Grid No. 1 Voltage........................ 80 V
Plate Current (Zero Signal) ................... 102 mA
Plate Current (Maximum Signal) ................ 230 mA
Grid No. 2 Current (Zero Signal) .............. 6 mA
Grid No. 2 Current (Maximum Signal) ........... 20 mA
Driving Power ................................. 0.35 W
Load Resistance ............................... 3.8K Ω
Power Output (approx) ......................... 60 W
Characteristics and Typical Operation
Class C Oscillator/Amplifier
Plate Voltage ................................. 375 V
Grid No. 2 Voltage ............................ 200 V
Grid No. 1 Voltage ............................ -35 V
Grid No. 1 Current ............................ 3.5 mA
Plate Current ................................. 88 mA
Grid No. 2 Current ............................ 9 mA
Driving Power ................................. 0.18 W
Power Output (approx) ......................... 17 W
Characteristics and Typical Operation
Class C Modulated Amplifier (Plate) (Triode Connected)
Plate Voltage ................................. 325 V
Grid No. 1 Voltage ............................ -70 V
Grid No. 1 Current ............................ 9 mA
Plate Current ................................. 65 mA
Driving Power ................................. 0.8 W
Power Output (approx) ......................... 11 W
Characteristic Curves
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