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

Voltage Pentode or Tetrode (under 100V) ·Pentode

ME1400

Electrometer pentode for extremely high-resistance circuits including pH meters, photocell units, and valve voltmeters.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
IO
Base pins
8
Nominal heater
4.5 V / 160 mA

Description

ELECTROMETER PENTODE P.ento'de suitable for use in high resistance circuits for applications such as pH meters, ME1400 photocell units and valve voltmeters. HEATER VYh 45+5% V Ih 160 mA MOUNTING POSITION Any CAPACITANCES Ca-gl <20 mpF Cin 5.5 pF Cout 8.5 pF CHARACTERISTICS Pentode connected The supplied datasheet publishes electrical ratings and characteristics for this pentode device.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
IO
Base pins
8
Nominal heater voltage
4.5 V
Nominal heater current
160 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
5000000 Ω
Transconductance
0.00024 S
Max plate voltage
90 V
Max screen voltage
45 V

Published ratings/characteristics promoted where clearly stated; repeated identical rectifier sections compressed to one section row.

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

1953 La Radiotechnique

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

  • Heater voltage

    4.5 V

    Published nominal value

  • Heater current

    160 mA

    Published nominal value

  • Transconductance

    240 µS

    Published typical/nominal value

Data set 02

1963 Mullard

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Heater or filament voltage

    4.5 V

  • Heater or filament current

    160 mA

  • MaxPlateVoltage

    90

    Promoted field source value

Characteristic

  • Plate Resistance

    5000000

    Promoted field source value

  • Transconductance

    0.00024

    Promoted field source value