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45
Power Triode

EIA Base & Outline

EIA Base: 4DEIA Bulb: 17-0
Source ........................................ RCA R-10 - 1932

45
Power Triode

EIA Base: 4DEIA Bulb: 14-1
Source ........................................ RCA RC-13 - 1937

Application

Source ........................................ RCA R-10 - 1932
The '45 is a power amplifier tube for supplying large undistorted output to a loudspeaker. It is for use as an audio-frequency output tube in a-c receivers using 2.5-volt heater and filament type tubes.

Mechanical Data

Source ........................................ RCA R-10 - 1932
Bulb .......................................... S-17
Base Type ..................................... Medium 4-Pin
EIA Outline ................................... 17-0
EIA Base ...................................... 4D
Mounting Position ............................. Vertical

Source ........................................ RCA RC-13 - 1937
Bulb .......................................... ST-14
EIA Outline ................................... 14-1

Electrical Data

Source ........................................ RCA R-10 - 1932
Filament Voltage .............................. 2.5 V
Filament Current .............................. 1.5 A

Direct Interelectrode Capacitances (approx)

Triode
Source ........................................ RCA R-10 - 1932
Input ......................................... 5 pf
Output ........................................ 3 pf
Grid to Plate ................................. 8 pf

Triode
Source ........................................ RCA RC-13 - 1937
Input ......................................... 4 pf
Output ........................................ 3 pf
Grid to Plate ................................. 7 pf

Maximum Ratings (Design Center Values)

Triode
Source ........................................ RCA R-10 - 1932
Plate Voltage ................................. 275 V

Characteristics and Typical Operation

Class A Amplifier
Source ........................................ RCA R-10 - 1932
Plate Voltage ................................. 180 V
Grid No. 1 Voltage ............................ -34.5 V
Amplification Factor .......................... 3.5
Plate Resistance (approx) ..................... 1900 Ω
Transconductance .............................. 1850 µMho
Plate Current ................................. 27 mA
Load Resistance ............................... 3500 Ω
Power Output (approx) ......................... 0.780 W

Class A Amplifier
Source ........................................ RCA R-10 - 1932
Plate Voltage ................................. 250 V
Grid No. 1 Voltage ............................ -50 V
Amplification Factor .......................... 3.5
Plate Resistance (approx) ..................... 1750 Ω
Transconductance .............................. 2000 µMho
Plate Current ................................. 34 mA
Load Resistance ............................... 3900 Ω
Power Output (approx) ......................... 1.6 W

Class A Amplifier
Source ........................................ RCA R-10 - 1932
Plate Voltage ................................. 275 V
Grid No. 1 Voltage ............................ -56 V
Amplification Factor .......................... 3.5
Plate Resistance (approx) ..................... 1670 Ω
Transconductance .............................. 2100 µMho
Plate Current ................................. 36 mA
Load Resistance ............................... 4600 Ω
Power Output (approx) ......................... 2 W

Class A Amplifier
Source ........................................ RCA RC-13 - 1937
Plate Voltage ................................. 180 V
Grid No. 1 Voltage ............................ -31.5 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 1020 Ω
Amplification Factor .......................... 3.5
Plate Resistance (approx) ..................... 1650 Ω
Transconductance .............................. 2125 µMho
Plate Current ................................. 31 mA
Load Resistance ............................... 2700 Ω
Power Output (approx) ......................... 0.825 W

Class A Amplifier
Source ........................................ RCA RC-13 - 1937
Plate Voltage ................................. 250 V
Grid No. 1 Voltage ............................ -50 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 1470 Ω
Amplification Factor .......................... 3.5
Plate Resistance (approx) ..................... 1610 Ω
Transconductance .............................. 2175 µMho
Plate Current ................................. 34 mA
Load Resistance ............................... 3900 Ω
Power Output (approx) ......................... 1.6 W

Class A Amplifier
Source ........................................ RCA RC-13 - 1937
Plate Voltage ................................. 275 V
Grid No. 1 Voltage ............................ -56 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 1550 Ω
Amplification Factor .......................... 3.5
Plate Resistance (approx) ..................... 1700 Ω
Transconductance .............................. 2050 µMho
Plate Current ................................. 36 mA
Load Resistance ............................... 4600 Ω
Power Output (approx) ......................... 2 W

Push Pull Class AB2 Amplifier
Source ........................................ RCA RC-13 - 1937
Plate Voltage ................................. 275 V
Grid No. 1 Voltage ............................ -68 V
Plate Current (Zero Signal) ................... 28 mA
Plate Current (Maximum Signal) ................ 138 mA
Load Resistance ............................... 3200 Ω
Power Output (approx) ......................... 18 W
Total Harmonic Distortion ..................... 5 %

Push Pull Class AB2 Amplifier
Source ........................................ RCA RC-13 - 1937
Plate Voltage ................................. 275 V
Grid No. 1 Voltage Derived from
Cathode Bias Resistor ...................... 775 Ω
Plate Current (Zero Signal) ................... 72 mA
Plate Current (Maximum Signal) ................ 90 mA
Load Resistance ............................... 5060 Ω
Power Output (approx) ......................... 12 W
Total Harmonic Distortion ..................... 5 %

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Thu, 30 Jun 2022 05:45:20 -0700