NJ7P SQL Tube Database Query

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89
Triple-Grid Power Amplifier

EIA Base & Outline

Application

Glass type used in output stage of radio receivers. Requires six-contact socket.

Mechanical Data

Bulb .......................................... ST-12
Base Type ..................................... Small 6-Pin
EIA Outline ................................... 12-6
EIA Base ...................................... 6F
Top Cap ....................................... Small Metal
Mounting Position ............................. Any

Electrical Data

Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.4 A

Characteristics and Typical Operation

Class A Amplifier (Triode Connected)
Plate Voltage ................................. 160 V
Grid No. 1 Voltage ............................ -20 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 1180 Ω
Amplification Factor .......................... 4.7
Plate Resistance (approx) ..................... 3.3K Ω
Transconductance .............................. 1425 µ
Plate Current ................................. 17 mA
Load Resistance ............................... 7K Ω
Power Output (approx) ......................... 0.3 W

Class A Amplifier (Triode Connected)
Plate Voltage ................................. 180 V
Grid No. 1 Voltage ............................ -22.5 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 1125 Ω
Amplification Factor .......................... 4.7
Plate Resistance (approx) ..................... 3K Ω
Transconductance .............................. 1550 µ
Plate Current ................................. 20 mA
Load Resistance ............................... 6.5K Ω
Power Output (approx) ......................... 0.4 W

Class A Amplifier (Triode Connected)
Plate Voltage ................................. 250 V
Grid No. 1 Voltage ............................ -31 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 970 Ω
Amplification Factor .......................... 4.7
Plate Resistance (approx) ..................... 2.6K Ω
Transconductance .............................. 1800 µ
Plate Current ................................. 32 mA
Load Resistance ............................... 5.5K Ω
Power Output (approx) ......................... 0.9 W

Class A Amplifier
Plate Voltage ................................. 100 V
Grid No. 2 Voltage ............................ 100 V
Grid No. 1 Voltage ............................ -10 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 900 Ω
Amplification Factor .......................... 125
Plate Resistance (approx) ..................... 104K Ω
Transconductance .............................. 1200 µ
Plate Current ................................. 9.5 mA
Grid No. 2 Current ............................ 1.6 mA
Load Resistance ............................... 10.7K Ω
Power Output (approx) ......................... 0.33 W
Total Harmonic Distortion ..................... 9 %

Class A Amplifier
Plate Voltage ................................. 135 V
Grid No. 2 Voltage ............................ 135 V
Grid No. 1 Voltage ............................ -13.5 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 830 Ω
Amplification Factor .......................... 125
Plate Resistance (approx) ..................... 92.5K Ω
Transconductance .............................. 1350 µ
Plate Current ................................. 14 mA
Grid No. 2 Current ............................ 2.2 mA
Load Resistance ............................... 9.2K Ω
Power Output (approx) ......................... 0.75 W
Total Harmonic Distortion ..................... 9 %

Class A Amplifier
Plate Voltage ................................. 180 V
Grid No. 2 Voltage ............................ 180 V
Grid No. 1 Voltage ............................ -18 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 785 Ω
Amplification Factor .......................... 125
Plate Resistance (approx) ..................... 80K Ω
Transconductance .............................. 1550 µ
Plate Current ................................. 20 mA
Grid No. 2 Current ............................ 3.0 mA
Load Resistance ............................... 8K Ω
Power Output (approx) ......................... 1.5 W
Total Harmonic Distortion ..................... 9 %

Class A Amplifier
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 250 V
Grid No. 1 Voltage ............................ -25 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 670 Ω
Amplification Factor .......................... 125
Plate Resistance (approx) ..................... 70K Ω
Transconductance .............................. 1800 µ
Plate Current ................................. 32 mA
Grid No. 2 Current ............................ 5.5 mA
Load Resistance ............................... 6750 Ω
Power Output (approx) ......................... 3.4 W
Total Harmonic Distortion ..................... 9 %

Push Pull Class B Amplifier (G1 & G2 G3 & P)
Plate Voltage ................................. 180 V
Grid No. 1 Voltage ............................ 0 V
Peak Grid No. 1 Voltage........................ 68 V
Plate Current (Zero Signal) ................... 6 mA
Plate Current (Maximum Signal) ................ 90 mA
Load Resistance ............................... 9.4K Ω
Power Output (approx) ......................... 3.5 W

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(c) 1994-2021 by William A. Beech, NJ7P

Tue, 28 Mar 2023 23:04:42 -0700