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A horizontal ribbon.

20
Power Amplifier

EIA Base & Outline

EIA Base: 4DEIA Bulb: 8-0
Source ........................................ RCA R-10 - 1932

Application

Source ........................................ RCA R-10 - 1932
The '20 is a three-electrode, high-vacuum, power amplifier tube designed for operation from dry-cells. It is intended for use in the last audio stage of dry-battery operated receivers using the '99 and/or '22.

Mechanical Data

Source ........................................ RCA R-10 - 1932
Bulb .......................................... T-8
Base Type ..................................... Small 4-Pin
EIA Outline ................................... 8-0
Maximum Overall Height ........................ 4-1/8 In.
Maximum Diameter .............................. 1-3/16 In.
EIA Base ...................................... 4D

Electrical Data

Source ........................................ RCA R-10 - 1932
Filament Voltage .............................. 3.3 DC V
Filament Current .............................. 0.125-0.132 A

Direct Interelectrode Capacitances (approx)

Triode
Source ........................................ RCA R-10 - 1932
Input ......................................... 2.0 pf
Output ........................................ 2.3 pf
Grid to Plate ................................. 4.1 pf

Maximum Ratings (Design Center Values)

Triode
Source ........................................ RCA R-10 - 1932
Plate Voltage ................................. 135 V

Characteristics and Typical Operation

Class A Amplifier
Source ........................................ RCA R-10 - 1932
Plate Voltage ................................. 90 V
Grid No. 1 Voltage ............................ -16.5 V
Amplification Factor .......................... 3.3
Plate Resistance (approx) ..................... 8000 Ω
Transconductance .............................. 415 µMho
Plate Current ................................. 3.0 mA
Load Resistance ............................... 9600 Ω
Power Output (approx) ......................... 0.045 W

Class A Amplifier
Source ........................................ RCA R-10 - 1932
Plate Voltage ................................. 135 V
Grid No. 1 Voltage ............................ -22.5 V
Amplification Factor .......................... 3.3
Plate Resistance (approx) ..................... 6300 Ω
Transconductance .............................. 525 µMho
Plate Current ................................. 6.5 mA
Load Resistance ............................... 6500 Ω
Power Output (approx) ......................... 0.11 W

Notes

Source ........................................ RCA RC-14 - 1940
1. Discontinued type!

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Thu, 30 Jun 2022 05:37:32 -0700