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Voltage Pentode or Tetrode (under 100V) ·Pentode

5875

Sharp-cutoff pentode designed for RF, VHF/UHF, wide-band, or voltage-amplifier service.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
1AD4
Socket code
B8D
Base pins
8
Nominal heater
1.25 V / 160 mA

Description

Directly heated filament-type sharp-cutoff subminiature pentode intended for compact low-power amplifier service.

Socket description

Subminiature 8-lead

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
1AD4
Socket code
B8D
Base pins
8
Nominal heater voltage
1.25 V
Nominal heater current
160 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

1AD4 - 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
300000 Ω
Transconductance
0.0015 S
Max plate voltage
90 V
Max screen voltage
90 V
Max plate dissipation
0.5 W
Max cathode current
10 mA

Published promoted fields populated semantically; identical repeated sections compressed.

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

1938 Raytheon

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • HeaterVoltageNominal

    1.25 V

    Nominal

  • HeaterCurrentNominal

    100 mA

    Nominal

  • Maximum Plate Voltage

    100 V

  • Maximum Plate Dissipation

    0.25 W

  • Maximum Cathode Current

    10 mA

Characteristic

  • Transconductance

    2500 µS

    Typical

  • Plate Resistance

    40000 ohm

    Typical

Data set 02

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Pentode

Capacitance

  • Input capacitance

    4 pF

    Section1

  • Output capacitance

    4 pF

    Section1

  • Grid-to-plate capacitance

    0.03 pF

    Section1

Other

  • Plate voltage

    90 V

    ClassA

  • Control-grid voltage

    0 V

    ClassA

  • Plate current

    3.5 mA

    ClassA

Characteristic

  • Plate resistance

    100000 Ω

    ClassA

  • Transconductance

    2500 µS

    ClassA

Data set 03

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Pentode

Capacitance

  • Grid To Plate Capacitance

    0.03 pF

    Maximum

  • Input Capacitance

    4 pF

Other

  • Filament Voltage

    1.25 V

    Radiosonde

Data set 04

1966 Tung Sol Electronic Tubes 3 of 4

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Heater voltage

    1.25 V

  • Heater current

    160 mA

  • Plate voltage

    90 V

    ClassA

  • Screen voltage

    90 V

    ClassA

  • Grid 1 voltage

    0 V

    ClassA

  • Plate current

    3.5 mA

    ClassA

  • Screen current

    1 mA

    ClassA

  • Maximum plate voltage

    90 V

  • Maximum screen voltage

    90 V

  • Maximum cathode current

    6.5 mA

Characteristic

  • Grid 1 voltage at transconductance 10 uS

    -3.5 V