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A horizontal ribbon.

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A horizontal ribbon.

71A
Power Amplifier Triode

EIA Base & Outline

EIA Base: 4DEIA Bulb: 14-0
Source ........................................ RCA R-10 - 1932

Application

Source ........................................ RCA R-10 - 1932
The '71A is a power amplifier tube of low output impedance for use in the output stage of audio-frequency amplifiers.

Mechanical Data

Bulb .......................................... ST-14
Base Type ..................................... Medium 4-Pin Bayonet
EIA Outline ................................... 14-1
EIA Base ...................................... 4D
Mounting Position ............................. Vertical

Electrical Data

Filament Voltage .............................. 5 DC V
Filament Current .............................. 0.5 A

Direct Interelectrode Capacitances (approx)

Triode
Input ......................................... 3.2 pf
Output ........................................ 2.9 pf
Grid to Plate ................................. 7.5 pf

Maximum Ratings (Design Center Values)

Triode
Plate Voltage ................................. 180 V

Characteristics and Typical Operation

Class A Amplifier
Plate Voltage ................................. 180 V
Grid No. 1 Voltage ............................ -40.5 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 2150 Ω
Amplification Factor .......................... 3
Plate Resistance (approx) ..................... 1750 Ω
Transconductance .............................. 1700 µMho
Plate Current ................................. 20 mA
Load Resistance ............................... 4800 Ω
Power Output (approx) ......................... 0.79 W

Class A Amplifier
Plate Voltage ................................. 135 V
Grid No. 1 Voltage ............................ -27 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 1700 Ω
Amplification Factor .......................... 3
Plate Resistance (approx) ..................... 1820 Ω
Transconductance .............................. 1650 µMho
Plate Current ................................. 17.3 mA
Load Resistance ............................... 3000 Ω
Power Output (approx) ......................... 0.4 W

Class A Amplifier
Plate Voltage ................................. 90 V
Grid No. 1 Voltage ............................ -16.5 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 1600 Ω
Amplification Factor .......................... 3
Plate Resistance (approx) ..................... 2170 Ω
Transconductance .............................. 1400 µMho
Plate Current ................................. 10 mA
Load Resistance ............................... 3000 Ω
Power Output (approx) ......................... 0.125 W

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A horizontal ribbon.

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Thu, 30 Jun 2022 06:23:48 -0700