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6AD7G
Low-Mu Triode - Power Pentode

Base & Bulb ( RCA DS 09/02/41)

Application

Glass octal type used in a push-pull amplifier circuit in conjunction with type 6F6G. Triode unit server as phase inverter. Tube requires octal socket. Pentode unit is similar to 6F6.

Mechanical Data

Bulb .......................................... ST-14
Base .......................................... Medium Shell Octal 8-pin
Outline ....................................... 14-3
EIA Base ...................................... 8AY
Mounting Position ............................. Any

Electrical Data

Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.85 A

Maximum Ratings (Design Center Values)

Pentode
Plate Voltage ................................. 375 V
Grid No. 2 Voltage ............................ 285 V
Plate Dissipation ............................. 8.5 W
Grid No. 2 Dissipation ........................ 2.7 W

Maximum Ratings (Design Center Values)

Triode
Plate Voltage ................................. 285 V
Plate Dissipation ............................. 1.0 W

Characteristics and Typical Operation

Triode Class A Amplifier
Plate Voltage ................................. 250 V
Grid No. 1 Voltage ............................ -25 V
Amplification Factor .......................... 6
Plate Resistance (approx) ..................... 19K Ω
Transconductance .............................. 325 µ
Plate Current ................................. 4 mA

Characteristics and Typical Operation

Pentode Class A Amplifier
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
Plate Resistance (approx) ..................... 80K Ω
Transconductance .............................. 2500 µ
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 ..................... 8 %

Characteristics and Typical Operation

Pentode PP Class A Amplifier
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 250 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ....................... 560 Ω
Peak Grid No. 1 Voltage........................ 59 V
Plate Current (Zero Signal) ................... 36 mA
Plate Current (Maximum Signal) ................ 41 mA
Grid No. 2 Current (Zero Signal) .............. 6.7 mA
Grid No. 2 Current (Maximum Signal) ........... 11.7 mA
Load Resistance ............................... 14K Ω
Power Output (approx) ......................... 6 W
Total Harmonic Distortion ..................... 4 %

Characteristics and Typical Operation

Pentode PP Class A Amplifier
Plate Voltage ................................. 285 V
Grid No. 2 Voltage ............................ 285 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ....................... 470 Ω
Peak Grid No. 1 Voltage........................ 64 V
Plate Current (Zero Signal) ................... 47.5 mA
Plate Current (Maximum Signal) ................ 54.5 mA
Grid No. 2 Current (Zero Signal) .............. 8.2 mA
Grid No. 2 Current (Maximum Signal) ........... 13.7 mA
Load Resistance ............................... 12K Ω
Power Output (approx) ......................... 8.5 W
Total Harmonic Distortion ..................... 4 %

Characteristics and Typical Operation

Pentode PP Class A Amplifier
Plate Voltage ................................. 375 V
Grid No. 2 Voltage ............................ 250 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ....................... 470 Ω
Peak Grid No. 1 Voltage........................ 55 V
Plate Current (Zero Signal) ................... 41 mA
Plate Current (Maximum Signal) ................ 50 mA
Grid No. 2 Current (Zero Signal) .............. 6.7 mA
Grid No. 2 Current (Maximum Signal) ........... 9.2 mA
Load Resistance ............................... 16K Ω
Power Output (approx) ......................... 9 W
Total Harmonic Distortion ..................... 2 %

Notes:

1. Pentode PP with a type 6F6G.

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