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Tube Substitutions for:
1U4
Sharp Cutoff RF Pentode

Type	Substitutes	Base Diagram
1U4	5910, 1T4, 1AF4*, 1U4WA, 5910
Notes:	* - Parallel filaments
Web References	1U4 (General Electric) @ Franks Electron Tubes 1U4 @ RadioMuseum.org

Sylvania Type 1U4
SHARP CUTOFF R F PENTODE


MECHANICAL DATA

Bulb	T-51/2
Outline	5-2
Base1	Miniature Button 7-Pin
Basing	6AR
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

DIRECT INTERELECTRODE CAPACITANCES (Shielded¹)

Grid to Plate	0.008	��f Max
Input	3.6	��f
Output	7.5	��f

MAXIMUM RATINGS (Design Center Values)

Plate Voltage	110	Volts
Grid No. 2 Voltage	110	Volts
Positive Grid No. 1 Voltage	0	Volts
Total Cathode Current	6.5	Ma

CHARACTERISTICS AND TYPICAL OPERATION
Class A₁ Amplifier

Plate Voltage	90	Volts
Grid No. 2 Voltage	90	Volts
Grid No. 1 Voltage	0	Volts
Plate Current	1.6	Ma
Grid No. 2 Current	0.45	Ma
Transconductance	900	�mhos
Plate Resistance (approx.)	1.5	Megohm
Grid No. 1 Bias for iB=10�mhos	4.0	Volts

NOTES:

1	Shield No. 316 connected to Pin 1.

APPLICATION
Sylvania Type 1U4 is a sharp cutoff pentode very similar in application and characteristics to Type 1LN5.

AVERAGE PLATE CHARACTERISTICS (Triode Connected)



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