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6F6
Power Amplifier Pentode

EIA Base & Outline

EIA Base: 7SEIA Bulb: 8-6
Source ........................................ RCA RC-15 - 1947

Application

Source ........................................ RCA RC-15 - 1947
Metal type used in the audio output stage of ac receivers. It is capable of large power output with relatively small input voltage. Requires octal socket and may be mounted in any position.

Source ........................................ RCA RC-15 - 1947
It is especially important that this tube, like other power-handling tubes, should be adequately ventilated.

Mechanical Data

Source ........................................ RCA RC-15 - 1947
Bulb .......................................... MT-8
Base Type ..................................... Small Wafer Octal 7-Pin
EIA Outline ................................... 8-6
EIA Base ...................................... 7S
Mounting Position ............................. Any

Electrical Data

Source ........................................ RCA RC-15 - 1947
Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.7 A
Maximum Heater-Cathode Voltage
Heater Positive with Respect to Cathode
DC Component ............................ 90 V
Heater Negative with Respect to Cathode
DC Component ............................ 90 V

Direct Interelectrode Capacitances (approx)

Pentode
Source ........................................ RCA RC-15 - 1947
Input ......................................... 6.5 pf
Output ........................................ 13 pf
Grid to Plate ................................. 0.2 pf

Maximum Ratings (Design Center Values)

Pentode
Source ........................................ RCA RC-15 - 1947
Plate Voltage ................................. 375 V
Grid No. 2 Voltage ............................ 285 V
Plate Dissipation ............................. 11 W
Grid No. 2 Dissipation ........................ 3.75 W

Characteristics and Typical Operation

Class A Amplifier (Triode Connected)
Source ........................................ RCA RC-15 - 1947
Plate Voltage ................................. 250 V
Grid No. 1 Voltage ............................ -20 V
Amplification Factor .......................... 7
Plate Resistance (approx) ..................... 2.7K Ω
Transconductance .............................. 2700 µMho
Plate Current (Zero Signal) ................... 31 mA
Plate Current (Maximum Signal) ................ 34 mA
Load Resistance ............................... 4K Ω
Power Output (approx) ......................... 0.85 W
Total Harmonic Distortion ..................... 5 %

Class A Amplifier
Source ........................................ RCA RC-15 - 1947
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 250 V
Grid No. 1 Voltage ............................ -16.5 V
Peak Grid No. 1 Voltage........................ 16.5 V
Amplification Factor .......................... 200
Plate Resistance (approx) ..................... 80K Ω
Transconductance .............................. 2500 µMho
Plate Current (Zero Signal) ................... 34 mA
Plate Current (Maximum Signal) ................ 36 mA
Grid No. 2 Current (Zero Signal) .............. 6.5 mA
Grid No. 2 Current (Maximum Signal) ........... 10.5 mA
Load Resistance ............................... 7K Ω
Power Output (approx) ......................... 3.2 W
Total Harmonic Distortion ..................... 7 %

Class A Amplifier
Source ........................................ RCA RC-15 - 1947
Plate Voltage ................................. 285 V
Grid No. 2 Voltage ............................ 285 V
Grid No. 1 Voltage ............................ -20 V
Peak Grid No. 1 Voltage........................ 20 V
Plate Resistance (approx) ..................... 78K Ω
Transconductance .............................. 2500 µMho
Plate Current (Zero Signal) ................... 38 mA
Plate Current (Maximum Signal) ................ 40 mA
Grid No. 2 Current (Zero Signal) .............. 7 mA
Grid No. 2 Current (Maximum Signal) ........... 13 mA
Load Resistance ............................... 7K Ω
Power Output (approx) ......................... 4.8 W
Total Harmonic Distortion ..................... 9 %

Class A Amplifier
Source ........................................ RCA RC-15 - 1947
Plate Voltage ................................. 315 V
Grid No. 2 Voltage ............................ 315 V
Grid No. 1 Voltage ............................ -22 V
Peak Grid No. 1 Voltage........................ 22 V
Amplification Factor .......................... 200
Plate Resistance (approx) ..................... 75K Ω
Transconductance .............................. 2650 µMho
Plate Current ................................. 42 mA
Grid No. 2 Current ............................ 8 mA
Load Resistance ............................... 7K Ω
Power Output (approx) ......................... 5 W
Total Harmonic Distortion ..................... 7 %

Class A Amplifier
Source ........................................ RCA RC-15 - 1947
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 250 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 410 Ω
Peak Grid No. 1 Voltage........................ 16.5 V
Plate Current (Zero Signal) ................... 34 mA
Plate Current (Maximum Signal) ................ 35 mA
Grid No. 2 Current (Zero Signal) .............. 7 mA
Grid No. 2 Current (Maximum Signal) ........... 9.7 mA
Load Resistance ............................... 7K Ω
Power Output (approx) ......................... 8.5 W
Total Harmonic Distortion ..................... 8.5 %

Class A Amplifier
Source ........................................ RCA RC-15 - 1947
Plate Voltage ................................. 285 V
Grid No. 2 Voltage ............................ 285 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 440 Ω
Peak Grid No. 1 Voltage........................ 20 V
Plate Current (Zero Signal) ................... 38 mA
Plate Current (Maximum Signal) ................ 38 mA
Grid No. 2 Current (Zero Signal) .............. 6.5 mA
Grid No. 2 Current (Maximum Signal) ........... 12 mA
Load Resistance ............................... 7K Ω
Power Output (approx) ......................... 9 W
Total Harmonic Distortion ..................... 9 %

Push Pull Class A Amplifier
Source ........................................ RCA RC-15 - 1947
Plate Voltage ................................. 315 V
Grid No. 2 Voltage ............................ 285 V
Grid No. 1 Voltage ............................ -24 V
Peak Grid No. 1 Voltage........................ 48 V
Plate Current (Zero Signal) ................... 62 mA
Plate Current (Maximum Signal) ................ 80 mA
Grid No. 2 Current (Zero Signal) .............. 12 mA
Grid No. 2 Current (Maximum Signal) ........... 19.5 mA
Load Resistance ............................... 10K Ω
Power Output (approx) ......................... 11 W
Total Harmonic Distortion ..................... 4 %

Push Pull Class A Amplifier
Source ........................................ RCA RC-15 - 1947
Plate Voltage ................................. 315 V
Grid No. 2 Voltage ............................ 285 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 320 Ω
Peak Grid No. 1 Voltage........................ 58 V
Plate Current (Zero Signal) ................... 62 mA
Plate Current (Maximum Signal) ................ 73 mA
Grid No. 2 Current (Zero Signal) .............. 12 mA
Grid No. 2 Current (Maximum Signal) ........... 18 mA
Load Resistance ............................... 10K Ω
Power Output (approx) ......................... 10.5 W
Total Harmonic Distortion ..................... 3 %

Push Pull Class AB2 Amplifier (Triode Connected)
Source ........................................ RCA RC-15 - 1947
Plate Voltage ................................. 350 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 730 Ω
Amplification Factor .......................... 123
Plate Current (Zero Signal) ................... 50 mA
Plate Current (Maximum Signal) ................ 60 mA
Load Resistance ............................... 10K Ω
Power Output (approx) ......................... 14 W
Total Harmonic Distortion ..................... 7 %

Push Pull Class AB2 Amplifier (Triode Connected)
Source ........................................ RCA RC-15 - 1947
Plate Voltage ................................. 350 V
Grid No. 1 Voltage ............................ -38 V
Amplification Factor .......................... 132
Plate Current (Zero Signal) ................... 45 mA
Plate Current (Maximum Signal) ................ 92 mA
Load Resistance ............................... 6K Ω
Power Output (approx) ......................... 18 W
Total Harmonic Distortion ..................... 7 %

Push Pull Class AB2 Amplifier
Source ........................................ RCA RC-15 - 1947
Plate Voltage ................................. 375 V
Grid No. 2 Voltage ............................ 250 V
Grid No. 1 Voltage ............................ -26 V
Amplification Factor .......................... 82
Plate Current (Zero Signal) ................... 34 mA
Plate Current (Maximum Signal) ................ 82 mA
Grid No. 2 Current (Zero Signal) .............. 5 mA
Grid No. 2 Current (Maximum Signal) ........... 20 mA
Load Resistance ............................... 10K Ω
Power Output (approx) ......................... 18.5 W
Total Harmonic Distortion ..................... 5 %

Push Pull Class AB2 Amplifier
Source ........................................ RCA RC-15 - 1947
Plate Voltage ................................. 375 V
Grid No. 2 Voltage ............................ 250 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 340 Ω
Amplification Factor .......................... 94
Plate Current (Zero Signal) ................... 54 mA
Plate Current (Maximum Signal) ................ 77 mA
Grid No. 2 Current (Zero Signal) .............. 8 mA
Grid No. 2 Current (Maximum Signal) ........... 18 mA
Load Resistance ............................... 10K Ω
Power Output (approx) ......................... 19 W
Total Harmonic Distortion ..................... 5 %

Class C Modulated Amplifier (Plate)
Source ........................................ RCA RC-15 - 1947
Plate Voltage ................................. 275 V
Grid No. 2 Voltage ............................ 200 V
Grid No. 1 Voltage ............................ -35 V
Grid No. 1 Current ............................ 2.8 mA
Plate Current ................................. 42 mA
Grid No. 2 Current ............................ 10 mA
Driving Power ................................. 0.16 W
Power Output (approx) ......................... 6 W

Class C Oscillator/Amplifier
Source ........................................ RCA RC-15 - 1947
Plate Voltage ................................. 350 V
Grid No. 2 Voltage ............................ 200 V
Grid No. 1 Voltage ............................ -35 V
Grid No. 1 Current ............................ 3.5 mA
Plate Current ................................. 50 mA
Grid No. 2 Current ............................ 10 mA
Driving Power ................................. 0.22 W
Power Output (approx) ......................... 9 W

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Wed, 08 Dec 2021 21:12:18 -0700