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

5CGP29

Single-gun Chromatron color CRT with two-color persistent phosphors, magnetic focusing and deflection, and electrostatic color selection. It is intended for radar and navigation displays requiring persistent color-coded information.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
Sections
1
Base
-
Socket code
NEOEIGHTAR7
Base pins
8
Nominal heater
6.3 V / 600 mA

Description

Single-gun Chromatron color CRT with two-color persistent phosphors, magnetic focusing and deflection, and electrostatic color selection for radar/navigation display applications.

Socket description

Small-button Neoeightar 7-contact CRT base family

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
NEOEIGHTAR7
Base pins
8
Nominal heater voltage
6.3 V
Nominal heater current
600 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
18000 V

Single-gun Chromatron color CRT; magnetic focus/deflection and electrostatic color selection.

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

1945 Litton Industries

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Other

  • Screen Voltage Maximum

    - to 18000 V

    Screen/ultor

  • Screen Voltage Typical

    16000 V

  • Grid 3 Voltage

    9000 to 12000 V

  • Color Selector Voltage

    - to 400 V

    Peak maximum

  • Color Grid to Phosphor Plate Voltage

    - to 8000 V

    Maximum

  • Seeker Voltage

    - to 350 V

    Maximum

  • Grid 1 Voltage

    -105 to -50 V

    Visual extinction

  • Focusing Coil Current

    60 to 80 mA

    JETEC focus coil #109

Characteristic

  • Grid 1 Capacitance

    6 pF

    To all other electrodes

  • Cathode Capacitance

    4 pF

    To all other electrodes

  • Color Selector Capacitance

    880 pF

    Selectors to each other

  • Phosphors

    P-25 orange / P-2 green

    Long persistence

  • Deflection Angle

    53 deg

    Approximate