NJ7P SQL Tube Database Query

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22
Sharp-Cutoff Tetrode

EIA Base & Outline

Application

Source ........................................ RCA R-10 - 1932
The '22 is a screen grid tube designed particularly for radio-frequency amplification in dry-battery-operated receivers employing 3.3 volt filament tubes.

Mechanical Data

Source ........................................ RCA R-10 - 1932
Bulb .......................................... S-14
Base Type ..................................... Medium 4-Pin
EIA Outline ................................... 14-2
Maximum Overall Height ........................ 5-1/32 In.
Maximum Diameter .............................. 1-13/16 In.
EIA Base ...................................... 4K
Top Cap ....................................... Small Metal
Mounting Position ............................. Vertical

Source ........................................ RCA RC-12 - 1934
Bulb .......................................... ST-14
Base Type ..................................... Medium 4-Pin
EIA Outline ................................... 14-2
EIA Base ...................................... 4K
Top Cap ....................................... Small Metal
Mounting Position ............................. Vertical

Electrical Data

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

Direct Interelectrode Capacitances (approx)

Tetrode
Source ........................................ RCA R-10 - 1932
Input ......................................... 3 pf
Output ........................................ 12 pf
Grid to Plate ................................. 0.02 pf

Tetrode
Source ........................................ RCA RC-12 - 1934
Input ......................................... 3.5 pf
Output ........................................ 10.0 pf
Grid to Plate ................................. 0.02 pf

Maximum Ratings (Design Center Values)

Tetrode
Source ........................................ RCA R-10 - 1932
Plate Voltage ................................. 135 V
Grid No. 2 Voltage ............................ 67.5 V

Characteristics and Typical Operation

Class A Amplifier
Source ........................................ RCA R-10 - 1932
Plate Voltage ................................. 135 V
Grid No. 2 Voltage ............................ 45 V
Grid No. 1 Voltage ............................ -1.5 V
Amplification Factor .......................... 270
Plate Resistance (approx) ..................... 725K Ω
Transconductance .............................. 375 µ
Plate Current ................................. 1.7 mA
Grid No. 2 Current ............................ 0.6 mA

Class A Amplifier
Source ........................................ RCA R-10 - 1932
Plate Voltage ................................. 135 V
Grid No. 2 Voltage ............................ 67.5 V
Grid No. 1 Voltage ............................ -1.5 V
Amplification Factor .......................... 160
Plate Resistance (approx) ..................... 325K Ω
Transconductance .............................. 500 µ
Plate Current ................................. 3.7 mA
Grid No. 2 Current ............................ 1.3 mA

Notes

Source ........................................ RCA RC-15 - 1947
1. Discontinued type.

If you are uncertain about the EIA designator for a particular tube please use the "Index" button to list all the tubes in the database. You can click on the designator for the closest tube.

(c) 1994-2021 by William A. Beech, NJ7P

Mon, 30 Jan 2023 01:15:47 -0700