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

571AP

Five-inch flying-lead micro-spot cathode-ray tube with combined magnetic and electrostatic focusing and magnetic deflection. Its approximately 30 kV anode capability supports high-resolution specialized display or recording.

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

Description

Five-inch flying-lead micro-spot cathode-ray tube with combined magnetic/electrostatic focusing and magnetic deflection.

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
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

  • UsefulScreenDiameterMinimum

    110 mm

  • GridVoltageForVisualCutoff

    -80 to -160 V

    FirstAnodeVoltage=2kV

  • CathodeToAllCapacitanceMaximum

    8 pF

  • GridToAllCapacitanceMaximum

    8 pF

Other

  • FinalAnodeVoltageMinimum

    12000 V

  • 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

  • ResolutionMinimum

    8000 lines