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400

Two-electrode high-vacuum laboratory tube designed for studying fundamental electron phenomena, using a pure tungsten filament for emission experiments.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: 4
Nominal heater: 4 V / 2.25 A

Description

Two-electrode high-vacuum tube designed and tested for study of fundamental electronic phenomena, using a pure tungsten filament suited to emission studies and a zirconium-coated nickel anode.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: -
Base pins: 4
Nominal heater voltage: 4 V
Nominal heater current: 2.25 A
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

Diode

X-ray radiationInterelectrode capacitances

Max plate voltage: 125 V
Max plate dissipation: 15 W

Maximum anode voltage and anode dissipation promoted from the printed maximum-ratings 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

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Diode

Other

Filament voltage maximum
4.75 V
Typical anode voltage
100 V
Typical anode current
25 mA
Filament diameter
0.005 in
Filament free length
1.25 in
Anode inside diameter
0.62 in