NJ7P SQL Tube Database Query

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32
Sharp-Cutoff Tetrode

EIA Base & Outline

EIA Base: 4KEIA Bulb: 14-01

Substitute Data

Preferred Substitutes ......................... 1A4 34
Substitutes ................................... 1B4
Source ........................................ RCA R-10 - 1932

32
Sharp-Cutoff Tetrode

EIA Base: 4KEIA Bulb: 14-2

Substitute Data

Preferred Substitutes ......................... 1A4 34
Substitutes ................................... 1B4
Source ........................................ RCA RC-13 - 1937

Application

Source ........................................ RCA R-10 - 1932
The '32 is a screen grid tube recommended primarily for use as a radio-frequency amplifier. It contains a coated filament which takes as little power as possible consistent with satisfactory operating performance. This feature makes the '32 particularly suitable in battery-operated radio receivers employing the '34, '31, and/or '33 where economy of filament current drain is important.

Mechanical Data

Source ........................................ RCA R-10 - 1932
Bulb .......................................... S-14
Base Type ..................................... Medium 4-Pin
EIA Outline ................................... 14-01
EIA Base ...................................... 4K
Top Cap ....................................... Small Metal
Mounting Position ............................. Vertical

Source ........................................ RCA RC-13 - 1937
Bulb .......................................... ST-14
EIA Outline ................................... 14-2

Electrical Data

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

Direct Interelectrode Capacitances (approx)

Tetrode
Source ........................................ RCA R-10 - 1932
Input ......................................... 6.0 pf
Output ........................................ 11.7 pf
Grid to Plate ................................. 0.015 pf

Tetrode
Source ........................................ RCA RC-13 - 1937
Input ......................................... 5.3 pf
Output ........................................ 10.5 pf
Grid to Plate ................................. 0.015 pf

Maximum Ratings (Design Center Values)

Tetrode
Source ........................................ RCA R-10 - 1932
Plate Voltage ................................. 180 V
Grid No. 2 Voltage ............................ 67.5 V

Characteristics and Typical Operation

Class A Amplifier
Source ........................................ RCA R-10 - 1932
Plate Voltage ................................. 180 V
Grid No. 2 Voltage ............................ 67.5 V
Grid No. 1 Voltage ............................ -3 V
Amplification Factor .......................... 780
Plate Resistance (approx) ..................... 1.2M Ω
Transconductance .............................. 650 µMho
Plate Current ................................. 1.7 mA
Grid No. 2 Current ............................ 0.4 mA

Class A Amplifier
Source ........................................ RCA R-10 - 1932
Plate Voltage ................................. 135 V
Grid No. 2 Voltage ............................ 67.5 V
Grid No. 1 Voltage ............................ -3 V
Amplification Factor .......................... 610
Plate Resistance (approx) ..................... 950K Ω
Transconductance .............................. 640 µMho
Plate Current ................................. 1.7 mA
Grid No. 2 Current ............................ 0.4 mA

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Tue, 24 May 2022 02:13:27 -0700