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4018AB

Early electrostatic cathode-ray oscillograph tube with a blue photographic screen, intended for measurement display; manufacturer data specifies deflection sensitivity and operation over roughly 300–2000 V anode supply.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

Sections: 1
Base: -
Socket code: BRITISH9
Base pins: -
Nominal heater: 0.75 V / 900 mA

Description

Standard Valves 4018AB is a gas-filled cathode-ray tube specified for replacement service. It operates over a 300-2000 V anode range with 350 V normal anode voltage and a 0-50 V shield supply. Its screen characteristic is blue photographic spot. One plate of each deflecting-plate pair is connected to the anode.

Socket description

Standard British 9-contact base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: BRITISH9
Base pins: -
Nominal heater voltage: 0.75 V
Nominal heater current: 900 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

Cathode Ray

X-ray radiationInterelectrode capacitances

Max plate voltage: 2000 V

Published ratings/characteristics promoted; remaining useful source values represented as parameters.

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

1937 Standard Valves

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Characteristics

Filament Current Range
700 mA to 1.1 A
Published range
Anode Voltage Range
300 to 2000 V
Published range
Normal Anode Voltage
350 V
Published specification
Shield Voltage Range
0 to 50 V
From a potentiometer

Other

Protective Resistance
2000 ohm
Include in shield circuit and anode circuit
Replacement Type
4050-AB
Published specification

Construction

Screen Characteristic
Blue spot for photographic work
Published specification
Deflection Plate Connection
One plate of each deflecting pair is connected to the anode
Published specification

Data set 02

1946 Standard Telephone and Cables

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Characteristics

Heater/filament voltage
0.75 V
Heater/filament current
900 mA

Other

Maximum direct anode voltage
2000 V
Anode voltage range
300–2000 V
Normal anode voltage
350 V
Shield voltage range
0–50 V