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

622AM

Six-inch triode cathode-ray tube designed for general flying-spot-scanner service, using magnetic focusing and magnetic deflection. Ferranti specifies anode capability to approximately 30 kV for bright optical scanning.

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

Description

Six-inch triode cathode-ray tube for general flying-spot-scanner service with magnetic focus and 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

    Magnetic

  • DeflectionMethod

    Magnetic

  • ScreenConstruction

    Metal-backed

  • UsefulScreenDiameterMinimum

    127 mm

  • AnodeVoltageRecommendedMinimum

    17000 V

  • AnodeVoltageRecommendedMaximum

    25000 V

  • CathodeToAllCapacitanceMaximum

    8 pF

  • GridToAllCapacitanceMaximum

    8 pF

Other

  • HeaterCathodeVoltageMaximum

    200 V

    HeaterNegative

  • HeaterCathodeVoltageMaximum

    200 V

    HeaterPositive

  • Anode Voltage

    25000 V

  • GridVoltageForVisualCutoff

    -200 V

  • GridDriveFor100uABeamCurrent

    37 V

  • ScreenResolution

    1000 lines

    50fps

  • LightOutput

    300 efc

    PPhosphor;100uABeam;10x10cmRaster

  • FocusCoil

    570 ampere-turn