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59
Power Amplifier Pentode

EIA Base & Outline

EIA Base: 7AEIA Bulb: 16-1
Source ........................................ RCA RC-13 - 1937

Application

Glass type used in audio output stages of ac-operated receivers. Requires medium seven-contact socket.

Mechanical Data

Bulb .......................................... ST-16
Base Type ..................................... Medium 7-Pin
EIA Outline ................................... 16-1
EIA Base ...................................... 7A
Mounting Position ............................. Any

Electrical Data

Heater Voltage ................................ 2.5 V
Heater Current ................................ 2 A

Maximum Ratings (Design Center Values)

Pentode
Plate Voltage ................................. 400 V
Grid No. 2 Voltage ............................ 200 V
Plate Dissipation ............................. 10 W
Grid No. 2 Dissipation ........................ 1.5 W

Characteristics and Typical Operation

Class A Amplifier (G1&G2 G3&P)
Plate Voltage ................................. 250 V
Grid No. 1 Voltage ............................ -28 V
Amplification Factor .......................... 6
Plate Resistance (approx) ..................... 2300 Ω
Transconductance .............................. 2600 µMho
Plate Current ................................. 26 mA
Load Resistance ............................... 5K Ω
Power Output (approx) ......................... 1.25 W

Class A Amplifier
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 250 V
Grid No. 1 Voltage ............................ -18 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 410 Ω
Amplification Factor .......................... 100
Plate Resistance (approx) ..................... 40K Ω
Transconductance .............................. 2500 µMho
Plate Current ................................. 35 mA
Grid No. 2 Current ............................ 9 mA
Load Resistance ............................... 6K Ω
Power Output (approx) ......................... 3 W
Total Harmonic Distortion ..................... 7 %

Push Pull Class B Amplifier (G1&G2 G3&P)
Plate Voltage ................................. 400 V
Grid No. 1 Voltage ............................ 0 V
Plate Current ................................. 26 mA
Load Resistance ............................... 6K Ω
Power Output (approx) ......................... 20 W

Push Pull Class B Amplifier (G1&G2 G3&P)
Plate Voltage ................................. 300 V
Grid No. 1 Voltage ............................ 0 V
Plate Current ................................. 20 mA
Load Resistance ............................... 4.6K Ω
Power Output (approx) ......................... 15 W

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Mon, 15 Aug 2022 17:43:06 -0700