NJ7P SQL Tube Database Query

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24A
Sharp-Cutoff Tetrode

EIA Base & Outline

EIA Base: 5EEIA Bulb: 14-01

Substitute Data

Preferred Substitutes ......................... 35 51
Source ........................................ RCA R-10 - 1932

24A
Sharp-Cutoff Tetrode

EIA Base: 5EEIA Bulb: 14-2

Substitute Data

Preferred Substitutes ......................... 35 51
Source ........................................ RCA RC-11 - 1933

Application

Source ........................................ RCA R-10 - 1932
The '24A is a screen grid amplifier containing a 2.5 volt uni-potential heater-cathode which permits operation from alternating current. This tube is recommended for use primarily as a radio-frequency amplifier in carefully shielded circuits especially designed for it. The '24A may also be used as a screen grid detector or audio amplifier.

Mechanical Data

Source ........................................ RCA R-10 - 1932
Bulb .......................................... S-14
Base Type ..................................... Medium 5-Pin
EIA Outline ................................... 14-0
EIA Base ...................................... 5E
Top Cap ....................................... Small Metal
Cathode ....................................... Coated Unipotential
Mounting Position ............................. Vertical

Source ........................................ RCA RC-11 - 1933
Bulb .......................................... ST-14
Base Type ..................................... Medium 5-pin
EIA Outline ................................... 14-01
EIA Base ...................................... 5E
Top Cap ....................................... Small Metal
Cathode ....................................... Coated Unipotential
Mounting Position ............................. Any

Electrical Data

Source ........................................ RCA R-10 - 1932
Heater Voltage ................................ 2.5 V
Heater Current ................................ 1.75 A
Heater Current Range at Volts ................. A @ V
Heater Warm-up Time ........................... s
Maximum Heater-Cathode Voltage ................ V
Maximum Heater-Cathode Voltage
Heater Positive with Respect to Cathode
DC Component ............................ V
Total DC and Peak ....................... V
Heater Negative with Respect to Cathode
DC Component ............................ V
Total DC and Peak ....................... V

Direct Interelectrode Capacitances (approx)

Tetrode
Source ........................................ RCA R-10 - 1932
Input ......................................... 5 pf
Output ........................................ 10 pf
Grid to Plate ................................. 0.01 pf

Tetrode
Source ........................................ RCA RC-12 - 1937
Input ......................................... 5.3 pf
Output ........................................ 10.5 pf
Grid to Plate ................................. 0.007 pf

Maximum Ratings (Design Center Values)

Tetrode
Source ........................................ RCA R-10 - 1932
Plate Voltage ................................. 275 V
Grid No. 2 Voltage ............................ 90 V

Characteristics and Typical Operation

Class A Amplifier
Source ........................................ RCA R-10 - 1932
Plate Voltage ................................. 180 V
Grid No. 2 Voltage ............................ 90 V
Grid No. 1 Voltage ............................ -3 V
Amplification Factor .......................... 400
Plate Resistance (approx) ..................... 400K Ω
Transconductance .............................. 1000 µMho
Plate Current ................................. 4 mA
Grid No. 2 Current ............................ < 1/3 Ip mA

Class A Amplifier
Source ........................................ RCA R-10 - 1932
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 90 V
Grid No. 1 Voltage ............................ -3 V
Amplification Factor .......................... 615
Plate Resistance (approx) ..................... 600K Ω
Transconductance .............................. 1025 µMho
Plate Current ................................. 4 mA
Grid No. 2 Current ............................ < 1/3 Ip mA

Class A Amplifier
Source ........................................ RCA RC-11 - 1933
Plate Voltage ................................. 250 V
Grid No. 2 Voltage ............................ 90 V
Grid No. 1 Voltage ............................ -3 V
Amplification Factor .......................... 630
Plate Resistance (approx) ..................... 600K Ω
Transconductance .............................. 1050 µMho
Plate Current ................................. 4 mA
Grid No. 2 Current ............................ 1.7 mA

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Mon, 04 Jul 2022 17:58:53 -0700