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Tube Substitutions for:
1LB4
Pentode Power Amplifier

Type	Substitutes	Base Diagram
1LB4	1LA4
Web References	1LB4 (RCA (HB3)) @ Franks Electron Tubes 1LB4 (Tung-Sol) @ Franks Electron Tubes 1LB4 @ RadioMuseum.org

Sylvania Type 1LB4
PENTODE POWER AMPLIFIER


MECHANICAL DATA

Bulb	T-9
Outline	9-30
Base1	Lock-in 8-Pin
Basing	5AD
Mounting Position	Any

ELECTRICAL DATA

FILAMENT CHARACTERISTICS

Filament Voltage D C	1.4	Volts
Filament Current	50	Ma
Filament Voltage D C (Abs Max)	1.6	Volts

MAXIMUM RATINGS (Design Center Values)

Plate Voltage	110	Volts
Grid No. 2 Voltage	110	Volts
Cathode Current	6.0	Ma

TYPICAL OPERATION

Plate Voltage	45	62.5	67.5	90	Volts
Grid No. 2 Voltage	45	62.5	67.5	90	Volts
Grid No. 1 Voltage	-4.5	-5.0	-6.0	-9.0	Volts
Plate Current (Zero Signal)	1.6	3.8	3.8	5.0	Ma
Grid No. 2 Current (Zero Signal)	0.3	0.8	0.8	1.0	Ma
Transconductance	650	875	875	925	�mhos
Plate Resistance (approx.)	0.4	0.3	0.3	0.25	Megohm
Load Resistance	20000	16000	16000	12000	Ohms
Power Output	35	90	100	200	Mw
Total Harmonic Distortion	10	10	10	10	Percent

NOTES:

1	Sylvania Type 3V4 is recommended for use in new equipment.

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