Skip to main content
Tube Tinker — Electron Tube Database
Alternatives & variationsDownload PDF datasheet

Specialized - Cathode Ray ·CathodeRay

574QM

Five-inch micro-spot radar cathode-ray tube with very high definition, combined magnetic and electrostatic focusing, magnetic deflection, and Q phosphor. Ferranti specifies approximately 30 kV maximum anode capability.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
Sections
1
Base
B12A
Socket code
-
Base pins
12
Nominal heater
6.3 V / 300 mA

Description

Five-inch micro-spot radar cathode-ray tube with very high definition, combined magnetic/electrostatic focusing, and Q phosphor.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
B12A
Socket code
-
Base pins
12
Nominal heater voltage
6.3 V
Nominal heater current
300 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

B12A - 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
30000 V

Ratings, characteristics, typical operating points, and capacitances were extracted from the supplied Ferranti datasheet.

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 Ferranti

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Characteristic

  • HeaterOrFilamentVoltage

    6.3 V

  • HeaterOrFilamentCurrent

    300 mA

  • FocusingMethod

    MagneticAndElectrostatic

  • DeflectionMethod

    Magnetic

  • Deflection Angle

    60 degree

  • ScreenConstruction

    Metal-backed Q phosphor

  • UsefulScreenDiameterMinimum

    110 mm

  • GridVoltageForVisualCutoff

    -80 to -160 V

    FirstAnodeVoltage=2kV

  • CathodeToAllCapacitanceMaximum

    8 pF

  • GridToAllCapacitanceMaximum

    8 pF

Other

  • FinalAnodeVoltageMaximum

    30000 V

  • FirstAnodeVoltageMinimum

    1000 V

  • FirstAnodeVoltageMaximum

    2500 V

  • HeaterCathodeVoltageMaximum

    200 V

    HeaterNegative

  • HeaterCathodeVoltageMaximum

    200 V

    HeaterPositive

  • FinalAnodeVoltage

    25000 V

  • FirstAnodeVoltage

    2000 V

  • GridVoltageForVisualCutoff

    -120 V

  • LineWidthApproximate

    0.001 in

    ScreenCentre