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Specialized - Cathode Ray ·CathodeRay

A4726W

47 cm monochrome television picture tube with electrostatic focusing, magnetic deflection, approximately 110-degree scanning, and high-voltage direct-view operation around 18–20 kV.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
Sections
1
Base
-
Socket code
-
Base pins
-
Nominal heater
6.3 V / 300 mA

Description

The Mullard A4726W is a direct-view monochrome television CRT with metal-backed screen

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
6.3 V
Nominal heater current
300 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

No fixed ratings are recorded for this section.

Published Telefunken ratings and characteristics promoted from the supplied 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

1959 Telefunken

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Characteristic

  • HeaterOrFilamentVoltage

    6.3 V

  • HeaterOrFilamentCurrent

    300 mA

  • UsefulScreenDiagonalMinimum

    446 mm

  • UsefulScreenWidthMinimum

    384 mm

  • UsefulScreenHeightMinimum

    305 mm

  • DeflectionMethod

    Magnetic

  • Deflection Angle

    110 degree

  • FocusingMethod

    Electrostatic

  • ScreenConstruction

    Metal-backed grey glass

Data set 02

1963 Mullard

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Characteristics

  • Heater Voltage

    6.3 V

  • Heater Current

    300 mA

  • Focusing Method

    Electrostatic text

  • Deflection Method

    Magnetic text

  • Deflection Angle

    110 deg

  • Light Transmission

    50 percent

    Approximate

  • Grid Cutoff Voltage Range

    -40 to -77 V

    AtFirstAnode=400V

  • Grid Cutoff Voltage Range

    -50 to -93 V

    AtFirstAnode=500V

Other

  • Final Anode Voltage

    20000 V

  • Focus Electrode Voltage Minimum

    0 V

  • Focus Electrode Voltage Maximum

    400 V

  • First Anode Voltage

    400 V

    OperatingOption1

  • First Anode Voltage

    500 V

    OperatingOption2

  • Maximum Heater Surge Voltage

    9.5 V

    SeriesHeaterOperation