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30
Medium-Mu Triode

Source ........................................ RCA RC-11 - 1933

Application

Source ........................................ RCA R-10 - 1932
The '30 is a detector and amplifier tube of the three-electrode type. It has a coated filament which takes as little power as possible consistent with satisfactory operating performance. This feature makes the '30 particularly suitable in battery-operated radio receivers employing the '32, '34, '31 and/or '33 where economy of filament current drain is important.

Mechanical Data

Source ........................................ RCA R-10 - 1932
Bulb .......................................... S-12
Base Type ..................................... Small 4-Pin
EIA Outline ................................... 12-0
EIA Base ...................................... 4D
Mounting Position ............................. Vertical

Source ........................................ RCA RC-11 - 1933
Bulb .......................................... ST-12
Base Type ..................................... Small 4-Pin
EIA Outline ................................... 12-5
EIA Base ...................................... 4D
Mounting Position ............................. Vertical

Electrical Data

Source ........................................ RCA R-10 - 1932
Filament Voltage .............................. 2.0 DC V
Filament Current .............................. 0.06 A

Direct Interelectrode Capacitances (approx)

Triode
Source ........................................ RCA R-10 - 1932
Input ......................................... 3.7 pf
Output ........................................ 2.1 pf
Grid to Plate ................................. 6.0 pf

Maximum Ratings (Design Center Values)

Triode
Source ........................................ RCA R-10 - 1932
Plate Voltage ................................. 180 V

Characteristics and Typical Operation

Class A Amplifier
Source ........................................ RCA R-10 - 1932
Plate Voltage ................................. 90 V
Grid No. 1 Voltage ............................ -4.5 V
Amplification Factor .......................... 9.3
Plate Resistance (approx) ..................... 11K Ω
Transconductance .............................. 850 µ
Plate Current ................................. 2.5 mA

Class A Amplifier
Source ........................................ RCA R-10 - 1932
Plate Voltage ................................. 135 V
Grid No. 1 Voltage ............................ -9 V
Amplification Factor .......................... 9.3
Plate Resistance (approx) ..................... 10.3K Ω
Transconductance .............................. 900 µ
Plate Current ................................. 3.0 mA

Class A Amplifier
Source ........................................ RCA R-10 - 1932
Plate Voltage ................................. 180 V
Grid No. 1 Voltage ............................ -13.5 V
Amplification Factor .......................... 9.3
Plate Resistance (approx) ..................... 10.3K Ω
Transconductance .............................. 900 µ
Plate Current ................................. 3.1 mA

Push Pull Class B Amplifier
Source ........................................ RCA RC-13 - 1937
Plate Voltage ................................. 157.5 V
Grid No. 1 Voltage ............................ -15 V
Plate Current ................................. 1.0 mA
Load Resistance ............................... 8K Ω
Power Output (approx) ......................... 2.1 W
Total Harmonic Distortion ..................... 6 %

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