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

23DCP4

Twenty-three-inch direct-view monochrome television picture tube with electrostatic focusing, magnetic deflection, and high-voltage operation. Manufacturer data documents its large-screen receiver-display construction, optical characteristics, and picture-tube operating limits.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
Sections
1
Base
-
Socket code
B7G
Base pins
-
Nominal heater
6.3 V / 450 mA

Description

23-inch 94-degree monochrome television CRT with electrostatic focus, magnetic deflection, and aluminized P4 screen.

Socket description

Miniature 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
B7G
Base pins
-
Nominal heater voltage
6.3 V
Nominal heater current
450 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
23500 V

Published electrical limits promoted from the source. Passive microwave reference cavities have their electrical frequency/Q values in TUBE_SECTION_PARAMETER because no applicable promoted frequency field exists in the fixed section schema.

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

1947 Westinghouse

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Other

  • HeaterVoltageNominal

    6.3 V

    Nominal

  • HeaterCurrentNominal

    450 mA

    Nominal

  • MaximumElectrodeOrAnodeVoltage

    23500 V

  • Grid2VoltageMaximum

    70 V

Characteristic

  • Heater Warmup Time

    11 s

Data set 02

1950 Sylvania

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Characteristics

  • Phosphor

    P4

  • Deflection method

    Magnetic

  • Focusing method

    Electrostatic

Data set 03

1965 Sylvania Electronic Tubes Vol3

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Characteristics

  • Focusing method

    Electrostatic

  • Deflection method

    Magnetic

  • Heater voltage

    6.3 V

  • Heater current

    450 mA

  • Diagonal deflection angle

    94 deg

  • Heater warm-up time

    11 s

Construction

  • Phosphor

    Aluminized P4

Other

  • Maximum anode voltage

    22000 V

  • Grid1 circuit resistance maximum

    1.5 Mohm

  • Anode voltage minimum

    11000 V

  • Typical anode voltage

    16000 V

  • Typical focus-electrode voltage

    0 to 400 V

  • Typical grid2 voltage

    30 V

  • Focus-electrode voltage minimum

    -550 V

  • Focus-electrode voltage maximum

    1100 V

  • Heater-cathode voltage maximum

    200 V

  • Grid2 voltage minimum

    20 V

  • Grid2 voltage maximum

    70 V

Application

  • Application

    Monochrome television picture display

Capacitance

  • Cathode-to-all capacitance

    5 pF

  • Grid1-to-all capacitance

    6 pF