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Tube Substitutions for:
24A
Sharp Cutoff Tetrode

Type	Substitutes	Base Diagram
24A	35§, 51, 24S, 35/51§, 35S§, 51S§, 35S/51S§
Notes:	§ - May not work in all circuits
Web References	24A (RCA) @ Franks Electron Tubes 24A (RCA (HB3)) @ Franks Electron Tubes 24A @ RadioMuseum.org

RCA Type 24A
SCREEN GRID RADIO-FREQUENCY AMPLIFIER


MECHANICAL DATA

Bulb	ST-14
Cap	Small Metal
Base	Medium 5 Pin
Basing	4K

ELECTRICAL DATA

FILAMENT CHARACTERISTICS

Filament Voltage	2.5	Volts
Filament Current	1.75	Amps

DIRECT INTERELECTRODE CAPACATIES

Grid-Plate Capacitance	0.007	��f
Input Capacitance	5.3	��f
Output Capacitance	10.5	��f

MAXIMUM RATINGS

Plate Voltage1	180	250	Volts
Grid Voltage	-3.0	-3.0	Volts
Screen Voltage	90	90	Volts
Plate Current	4.0	4.0	Ma
Screen Current	1.7	1.7	Ma
Plate Resistance	400000	600000	Ohms
Amplification Factor	400	630	x
Transconductance	1000	1050	�mhos

NOTES:

1	Maximum plate voltage == 275 volts.

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