Skip to main content
Tube Tinker — Electron Tube Database
Alternatives & variationsDownload PDF datasheet

Voltage Pentode ·Pentode

1W4

Directly heated power-amplifier pentode designed for battery-operated receiver output service with published Class-A operating conditions.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
5BZ
Socket code
B7G
Base pins
7
Nominal heater
1.4 V / 50 mA

Description

The 1W4 is a Pentode vacuum tube as described by the source datasheet.

Socket description

Miniature 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
5BZ
Socket code
B7G
Base pins
7
Nominal heater voltage
1.4 V
Nominal heater current
50 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

5BZ - 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
250000 Ω
Transconductance
0.000925 S
Max plate voltage
110 V
Max screen voltage
110 V
Max cathode current
6 mA

Directly heated power-amplifier pentode for battery-operated output service.

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

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

  • Input capacitance

    3.6 pF

  • Output capacitance

    7 pF

  • Grid-to-plate capacitance

    0.1 pF

  • Plate resistance

    250000 ohm

    ClassA; OperatingPoint1

  • Transconductance

    925 uS

    ClassA; OperatingPoint1

  • Plate resistance

    300000 ohm

    ClassA; OperatingPoint2

  • Transconductance

    875 uS

    ClassA; OperatingPoint2

  • Plate resistance

    400000 ohm

    ClassA; OperatingPoint3

  • Transconductance

    650 uS

    ClassA; OperatingPoint3

Other

  • Plate voltage

    90 V

    ClassA; OperatingPoint1

  • Screen voltage

    90 V

    ClassA; OperatingPoint1

  • Control-grid bias

    9 V

    ClassA; OperatingPoint1

  • Plate current

    5 mA

    ClassA; OperatingPoint1

  • Screen current

    1 mA

    ClassA; OperatingPoint1

  • Load resistance

    12000 ohm

    ClassA; OperatingPoint1

  • Power output

    0.2 W

    ClassA; OperatingPoint1

  • Plate voltage

    67.5 V

    ClassA; OperatingPoint2

  • Screen voltage

    67.5 V

    ClassA; OperatingPoint2

  • Control-grid bias

    6 V

    ClassA; OperatingPoint2

  • Plate current

    3.8 mA

    ClassA; OperatingPoint2

  • Screen current

    0.8 mA

    ClassA; OperatingPoint2

  • Load resistance

    16000 ohm

    ClassA; OperatingPoint2

  • Power output

    0.1 W

    ClassA; OperatingPoint2

  • Plate voltage

    45 V

    ClassA; OperatingPoint3

  • Screen voltage

    45 V

    ClassA; OperatingPoint3

  • Control-grid bias

    4.5 V

    ClassA; OperatingPoint3

  • Plate current

    1.6 mA

    ClassA; OperatingPoint3

  • Screen current

    0.3 mA

    ClassA; OperatingPoint3

  • Load resistance

    20000 ohm

    ClassA; OperatingPoint3

  • Power output

    0.035 W

    ClassA; OperatingPoint3

  • Maximum plate voltage

    110 V

  • Maximum screen voltage

    110 V

Data set 02

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Heater voltage

    1.4 V

    Nominal

  • Heater current

    50 mA

    Nominal