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Specialized - Cathode Ray ·CathodeRay

23SP4

Large P4 monochrome television picture tube designed for high-voltage direct-view service, using manufacturer-specified focusing, magnetic deflection, and beam-control arrangements for type 23SP4.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
Sections
1
Base
-
Socket code
DUODECAL5
Base pins
-
Nominal heater
6.3 V / 600 mA

Description

23-inch 110-degree Twin-Panel monochrome television CRT with electrostatic focus and magnetic deflection.

Socket description

Small-shell Duodecal 5-contact CRT base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
DUODECAL5
Base pins
-
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
22000 V

Direct-view CRT; maximum anode voltage promoted. Source warns of possible X-radiation exposure above specified voltage conditions.

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

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 02

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

  • Horizontal deflection angle

    99 deg

  • Diagonal deflection angle

    110 deg

  • Vertical deflection angle

    82 deg

  • Fluorescence

    White

  • Persistence

    Short to medium

  • Heater voltage

    6.3 V

  • Heater current

    600 mA

Construction

  • Phosphor

    Aluminized P4

Other

  • Maximum anode voltage

    22000 V

  • Typical anode voltage

    16000 V

  • Typical focus-electrode voltage maximum

    400 V

  • Typical grid2 voltage

    300 V

  • Cutoff voltage range

    -35 to -72 V

  • Grid1 circuit resistance maximum

    1.5 Mohm

  • Focus-electrode voltage minimum

    -550 V

  • Focus-electrode voltage maximum

    1100 V

  • Grid2 voltage maximum

    550 V

  • X-radiation precaution

    Operate within published maximum anode-voltage rating; source carries X-radiation warning at elevated EHT.

Capacitance

  • Grid1-to-all capacitance

    6 pF

  • External conductive coating to anode capacitance maximum

    2500 pF

Application

  • Application

    Monochrome television picture display

Data set 03

1965 Westinghouse Data Book

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Characteristics

  • Heater Voltage

    6.3 V

  • Heater Current

    600 mA

  • Focusing Method

    Low Voltage Electrostatic text

  • Deflection Method

    Magnetic text

  • Horizontal Deflection Angle

    85 deg

    Approximate

  • Vertical Deflection Angle

    68 deg

    Approximate

  • Diagonal Deflection Angle

    90 deg

    Approximate

  • Phosphor

    Aluminized P4 text

  • Fluorescence

    White text

  • Light Transmittance

    73 percent

    Approximate

  • Cathode-to-All Capacitance

    5 pF

    Approximate

  • Grid1-to-All Capacitance

    6 pF

    Approximate

  • External Coating-to-Anode Capacitance Minimum

    2000 pF

  • External Coating-to-Anode Capacitance Maximum

    2500 pF

Other

  • Maximum Anode Voltage

    20000 V

  • Minimum Anode Voltage

    11000 V

  • Maximum Focus Electrode Positive Voltage

    1100 V

    Grid4

  • Maximum Focus Electrode Negative Voltage

    -550 V

    Grid4

  • Maximum Grid2 Voltage

    500 V

  • Minimum Grid2 Voltage

    200 V

  • Maximum Heater-Cathode Voltage During Warmup

    450 V

    Duration<=15s

  • Maximum Heater-Cathode Voltage After Warmup

    200 V

  • Typical Anode Voltage

    16000 V

    CathodeDrive

  • Typical Focus Voltage Minimum

    0 V

    Grid4

  • Typical Focus Voltage Maximum

    400 V

    Grid4

  • Typical Grid2 Voltage

    450 V

    CathodeDrive

  • Cathode Voltage for Raster Cutoff Minimum

    45 V

    CathodeDrive

  • Cathode Voltage for Raster Cutoff Maximum

    105 V

    CathodeDrive

  • Maximum Grid1 Circuit Resistance

    1.5 Mohm