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Specialized - Cathode Ray ·CathodeRay

23BRP4

Twenty-three-inch aluminized P4 television picture tube with tri-potential electrostatic focusing and magnetic deflection. Its high-voltage anode system is rated around 22 kV for direct-view monochrome receiver display.

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

Description

The Sylvania 23BRP4 is a 23-inch aluminized P4 television cathode-ray tube with tri-potential electrostatic focus and magnetic deflection.

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
-
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

    Tri-potential electrostatic

Data set 02

1965 Sylvania Electronic Tubes Vol3

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Characteristics

  • Heater Voltage

    6.3 V

  • Heater Current

    300 mA

  • Heater Warm-up Time

    11 s

  • Focusing Method

    Tri-Potential Electrostatic text

  • Deflection Method

    Magnetic text

  • Horizontal Deflection Angle

    99 deg

    Approximate

  • Vertical Deflection Angle

    82 deg

    Approximate

  • Diagonal Deflection Angle

    110 deg

    Approximate

  • Phosphor

    Aluminized P4 text

  • Fluorescence

    White text

  • Persistence

    Short to Medium text

  • Light Transmittance

    40 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

  • Anti-Reflection Safety Plate

    Yes text

Other

  • Maximum Anode Voltage

    22000 V

  • Minimum Anode Voltage

    12000 V

  • Maximum Grid2 Voltage

    600 V

  • Maximum Heater-Cathode Voltage During Warmup

    450 V

    Duration<=15s

  • Maximum Heater-Cathode Voltage After Warmup

    200 V

  • Typical Anode Voltage

    16000 V

  • Typical Grid2 Voltage

    500 V

  • Focus Voltage Minimum

    0 V

  • Focus Voltage Maximum

    400 V

  • Cutoff Voltage Minimum

    -78 V

  • Cutoff Voltage Maximum

    -43 V

  • Maximum Grid1 Circuit Resistance

    1.5 Mohm

  • Drive Mode

    Grid Drive text