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Tube Substitutions for:
1A4P
Remote Cutoff Pentode

Type	Substitutes	Base Diagram
1A4P	1B4, 1C4*, 1K4, 1A4, 1A4T, 1B4G, 1B4T, 951, 32, 34, 1K4*
Notes:	* - Parallel filaments
Web References	1A4P (RCA (HB3)) @ Franks Electron Tubes 1A4P (Sylvania) @ Franks Electron Tubes 1A4P (Tung-Sol) @ Franks Electron Tubes 1A4P @ RadioMuseum.org

Sylvania Type 1A4P
PENTODE


MECHANICAL DATA

Bulb	ST-12
Basing	4M

ELECTRICAL DATA

FILAMENT CHARACTERISTICS

Filament Voltage	2.0	Volts
Filament Current	0.06	Amps

ELECTRICAL DATA

MAXIMUM RATINGS (Design Center)
R F Amplifier

Plate Voltage	135	180	Volts
Screen Voltage	67.5	67.5	Volts
Grid Voltage	-3.0	-3.0	Volts
Plate Current	2.2	2.3	Ma
Screen Current	0.9	0.8	Ma
Plate Resistance	1.0	1.0	Megohm
Transconductance	625	725	�mhos

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