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

5G14AJ

High-resolution magnetic-focus, magnetic-deflection cathode-ray display tube with a metal-backed phosphor screen, designed for 15–30 kV second-anode operation and fine-line imaging.

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

Description

Five-inch high-resolution high-light-output cathode-ray display tube with magnetic focus/deflection and metal-backed A 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

    Magnetic

  • DeflectionMethod

    Magnetic

  • ScreenConstruction

    Metal-backed A phosphor

  • UsefulScreenDiameterMinimum

    108 mm

  • CathodeToAllCapacitanceMaximum

    15 pF

  • GridToAllCapacitanceMaximum

    15 pF

Other

  • FirstAnodeVoltageMinimum

    300 V

  • FirstAnodeVoltageMaximum

    600 V

  • SecondAnodeVoltageMinimum

    15000 V

  • SecondAnodeVoltageMaximum

    30000 V

  • HeaterCathodeVoltageMaximum

    250 V

    HeaterPositive

  • HeaterCathodeVoltageMaximum

    150 V

    HeaterNegative

  • CathodeResistanceMaximum

    10 Mohm

  • GridResistanceMaximum

    1.5 Mohm

  • FirstAnodeVoltage

    500 V

  • SecondAnodeVoltage

    25000 V

  • GridVoltageForVisualCutoff

    -105 V

  • LineWidth

    125 um

    AOrPPhosphor;BeamCurrent=50uA

  • SpatialFrequencyResponse

    95 cycles/cm

    60PercentModulation;BeamCurrent=1uA

  • SpatialFrequencyResponse

    30 cycles/cm

    60PercentModulation;BeamCurrent=50uA