Home  Resources  References  Tubes  Forums  Links  Support  Sale 

Tube Substitutions for:
1S5
Diode - Sharp Cutoff Pentode

Type	Substitutes	Base Diagram
1S5	1H2, 1AF5*, 1AH5*, 1AR5*
Notes:	* - Parallel filaments
Web References	1S5 (Mazda-Belvu) @ Franks Electron Tubes 1S5 (General Electric) @ Franks Electron Tubes 1S5 (Brimar) @ Franks Electron Tubes 1S5 @ RadioMuseum.org

Sylvania Type 1S5
DIODE PENTODE


MECHANICAL DATA

Bulb	T-51/2
Outline	5-2
Base	Miniature Button 7-Pin
Basing	6AU
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

DIRECT INTERELECTRODE CAPACITANCES (unshielded)

Diode Plate to Grid No. 1

0.1

��f Max

MAXIMUM RATINGS (Design Center Values)
Class A₁ Amplifier

Plate Voltage	90	Volts
Grid No. 2 Voltage	90	Volts
Positive D C Grid No. 1 Voltage	0	Volts
Negative D C Grid No. 1 Voltage	50	Volts
Cathode Current	3.0	Ma
Diode Current for Continuous Operation	0.25	Ma

CHARACTERISTICS AND TYPICAL OPERATION
Class A₁ Amplifier

Plate Voltage	67.5	90	Volts
Grid No. 2 Voltage	67.5	67.5	Volts
Grid No. 1 Voltage	0	0	Volts
Plate Current	1.6	2.7	Ma
Grid No. 2 Current	0.4	0.5	Ma
Transconductance	625	720	�mhos
Plate Resistance (approx.)	0.6	0.5	Megohm
Grid No. 1 Bias Ib=10�a		-5	Volts
Average Diode Current at 10 Volts D C		1.5	Ma

APPLICATION
Sylvania type 1S5 is a diode pentode of the miniature construction, especially designed for detector-audio service in compact, light weight, portable equipment. The high operating efficiency allows the tube to be use with extremely low B supply voltages. The internal construction of Type 1S5 is similar to that of Sylvania Type 1LD5.

AVERAGE CONVERSION CHARACTERISTICS


AVERAGE PLATE CHARACTERISTICS


AVERAGE CHARACTERISTICS



© 1996-2021 Nostalgia Air