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Tube Tinker — Electron Tube Database
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Specialized - Cathode Ray ·CathodeRay

E40G3

Four-inch green-screen oscillograph CRT with double electrostatic deflection, designed for direct-view electronic waveform measurement.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
Sections
1
Base
-
Socket code
-
Base pins
-
Nominal heater
4 V / 1 A

Description

Four-inch green-screen double-electrostatic oscillograph CRT.

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
4 V
Nominal heater current
1 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

Cathode Ray

X-ray radiationInterelectrode capacitances
Max plate voltage
800 V

Published ratings, characteristics, operating conditions and capacitances extracted from supplied Mullard source.

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

1963 Mullard

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Characteristic

  • HeaterOrFilamentVoltage

    4 V

  • HeaterOrFilamentCurrent

    1 A

  • GridToAllCapacitance

    6 pF

  • DeflectionPlatePair1Capacitance

    1 pF

  • DeflectionPlatePair2Capacitance

    3 pF

  • DeflectionMethod

    Double electrostatic

Other

  • SecondAnodeVoltage

    500 V

  • SecondAnodeVoltage

    800 V

  • FirstAnodeVoltageForFocus

    140 V

    Anode2=500V

  • FirstAnodeVoltageForFocus

    220 V

    Anode2=800V

  • DeflectionSensitivity1

    0.35 mm/V

    Anode2=500V

  • DeflectionSensitivity2

    0.24 mm/V

    Anode2=500V

  • WritingSpeedMaximum

    0.3 km/s

  • FirstAnodeVoltageMaximum

    275 V