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

Specialized - Cathode Ray ·CathodeRay

571AM

Five-inch micro-spot high-resolution cathode-ray tube using combined magnetic and electrostatic focusing with magnetic deflection. Ferranti specifies anode capability to approximately 30 kV for extremely fine spot formation.

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 high-resolution 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
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

  • 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