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46
Dual Grid Power Amplifier

EIA Base & Outline

EIA Base: 5CEIA Bulb: 17-0
Source ........................................ RCA R-10 - 1932

Application

Source ........................................ RCA R-10 - 1932
The '46 is a double-grid power amplifier tube recommended especially for service in Class B amplifier circuits of suitable design. In such circuits an output stage is preceded by a power amplifier stage designated as the driver. A pair of '46's in a Class B output stage is capable of supplying an exceptionally large amount of virtually undistorted power; while a single '46, operated in the driver stage as a Class A amplifier, can deliver sufficient power to drive the pair of '46's in the output stage.

The dual application of the '46 to Class B and to Class A amplifier service is made possible by different connections of the two grids incorporated in the tube's structure. Each grid terminates in its respective base pin. For Class B operation, the two grids must be tied together. This connection causes the tube to have an amplification factor so high that negative grid bias is not required for its operation as a Class B amplifier. For Class A operation, the grid adjacent to the plate is tied to the plate in order that the tube will have a low amplification factor. In the latter case, negative grid bias is required for proper operation of the tube.

Mechanical Data

Source ........................................ RCA R-10 - 1932
Bulb .......................................... S-17
Base Type ..................................... Medium 5-Pin
EIA Outline ................................... 17-0
EIA Base ...................................... 5C
Mounting Position ............................. Any

Electrical Data

Source ........................................ RCA R-10 - 1932
Filament Voltage .............................. 2.5 V
Filament Current .............................. 1.75 A

Maximum Ratings (Design Center Values)

Tetrode
Source ........................................ RCA R-10 - 1932
Plate Voltage ................................. 400 V

Tetrode
Source ........................................ RCA RC-13 - 1937
Plate Voltage ................................. 400 V
Plate Dissipation ............................. 10 W
Plate Current ................................. 200 mA

Characteristics and Typical Operation

Class A Amplifier
Source ........................................ RCA R-10 - 1932
Plate Voltage ................................. 250 V
Grid No. 1 Voltage ............................ -33 V
Amplification Factor .......................... 5.6
Plate Resistance (approx) ..................... 2380 Ω
Transconductance .............................. 2350 µMho
Plate Current ................................. 22 mA
Load Resistance ............................... 6.4K Ω
Power Output (approx) ......................... 1.25 W

Push Pull Class B Amplifier
Source ........................................ RCA R-10 - 1932
Plate Voltage ................................. 300 V
Grid No. 1 Voltage ............................ 0 V
Peak Grid No. 1 Voltage........................ 113 V
Plate Current (Zero Signal) ................... 8 mA
Plate Current (Maximum Signal) ................ 150 mA
Driving Power ................................. 0.95 W
Load Resistance ............................... 5200 Ω
Power Output (approx) ......................... 16 W

Push Pull Class B Amplifier
Source ........................................ RCA R-10 - 1932
Plate Voltage ................................. 400 V
Grid No. 1 Voltage ............................ 0 V
Peak Grid No. 1 Voltage........................ 116 V
Plate Current (Zero Signal) ................... 12 mA
Plate Current (Maximum Signal) ................ 200 mA
Driving Power ................................. 0.65 W
Load Resistance ............................... 5800 Ω
Power Output (approx) ......................... 20 W

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Mon, 15 Aug 2022 18:10:56 -0700