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Voltage Tetrode ·Tetrode

VE418

Subminiature low-filament-power tetrode designed as an electrometer amplifier with extremely high input resistance for precision measurement of very small electrical currents.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
-
Base pins
-
Nominal heater
1.25 V / 9 mA

Description

Subminiature low-filament-power tetrode designed as an electrometer amplifier with very high input resistance. The same source also identifies this device as VE418.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
-
Base pins
-
Nominal heater voltage
1.25 V
Nominal heater current
9 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

Tetrode

X-ray radiationInterelectrode capacitances
Max cathode current
0.012 mA

Total cathode current limit promoted from the searchable source table.

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

1950 Victoreen

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Characteristic

  • Filament Voltage

    1.12 to 1.38 V

  • Filament Current

    9 mA

    Nominal

Other

  • Total Cathode Current

    12 uA

  • PositiveVoltageOnAnyElectrode

    25 V

  • PlateCurrentAt250V

    6 to 18 uA

Capacitance

  • Grid1Capacitance

    2 pF

  • Grid2Capacitance

    2 pF

  • Plate Capacitance

    3 pF