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Specialized - Cathode Ray ·CathodeRay

A4911X

49 cm-class monochrome television picture tube documented for high-voltage direct-view service, using magnetic deflection and manufacturer-specified focusing and beam-control characteristics.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
Sections
1
Base
-
Socket code
-
Base pins
-
Nominal heater
6.3 V / 900 mA

Description

The Mullard A4911X is a 49 cm rectangular shadow-mask colour television CRT with three electron guns and metal-backed three-colour phosphor-dot 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
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

No fixed ratings are recorded for this section.

Representative of three identical electron-gun sections.

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

Characteristics

  • Heater Voltage

    6.3 V

  • Heater Current

    900 mA

  • Focusing Method

    Electrostatic text

  • Deflection Method

    Magnetic text

  • Deflection Angle

    90 deg

  • Light Transmission

    54 percent

    Approximate

  • Grid Cutoff Voltage Range

    -65 to -135 V

    EachGun; Va1=300V

  • Light Output at Screen Centre

    130 cd/m2

    FocusedRaster

  • White Point x

    0.281 ratio

  • White Point y

    0.311 ratio

Other

  • Final Anode Voltage

    25000 V

    EachGun

  • Focus Electrode Voltage Minimum

    4200 V

    EachGun

  • Focus Electrode Voltage Maximum

    5000 V

    EachGun