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Voltage Pentode ·Pentode

373A

Western Electric oxide-filament general-purpose pentode intended for electronic amplification.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
-
Base pins
7
Nominal heater
2 V / 250 mA

Description

Oxide-filament general-purpose pentode from the Western Electric general-purpose tube table.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
-
Base pins
7
Nominal heater voltage
2 V
Nominal heater current
250 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

1 physical section, each with unique specifications.

Section 1

Pentode

X-ray radiationInterelectrode capacitances
Plate resistance
1500000 Ω
Transconductance
0.00128 S
Max plate voltage
250 V
Max screen voltage
150 V
Max plate dissipation
2 W
Max screen dissipation
0.45 W

Representative characteristics use the 150 V plate/screen operating point printed in the datasheet; alternate 250 V values are preserved as parameters.

Source-dependent data

Operating conditions by source

Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.

Data set 01

1956 Western Electric Tubes

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

  • HeaterOrFilamentVoltage

    2 V

  • HeaterOrFilamentCurrent

    250 mA

Other

  • Typical Plate Voltage

    150 V

    ClassA

  • Typical Plate Current

    2 mA

    ClassA

Data set 02

2026 Western Electric 300s

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • GridPlateCapacitance

    0.07 pF

  • Input Capacitance

    5.9 pF

  • Output Capacitance

    5 pF

Characteristic

  • Plate Resistance

    2000000 ohm

    Plate=250 V; Screen=150 V

  • Transconductance

    1310 uS

    Plate=250 V; Screen=150 V

  • Plate Current

    2 mA

    Plate=150 V; Screen=150 V; Grid=-3 V

  • Power Output

    120 mW

    Plate=150 V; Screen=150 V

  • Power Output

    160 mW

    Plate=250 V; Screen=150 V