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Specialized - Cathode Ray ·CathodeRay

23ALP4

Large P4 monochrome television picture tube for high-voltage direct-view service, using magnetic deflection and manufacturer-specified focusing and beam-control arrangements for type 23ALP4.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
Sections
1
Base
-
Socket code
NEOEIGHTAR7
Base pins
-
Nominal heater
6.3 V / 450 mA

Description

The Sylvania 23ALP4 is a 23-inch aluminized P4 television cathode-ray tube with 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
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

No fixed ratings are recorded for this section.

Television CRT electron-gun/display section.

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

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

    450 mA

  • Heater Warm-up Time

    11 s

  • Focusing Method

    Electrostatic text

  • Deflection Method

    Magnetic text

  • Horizontal Deflection Angle

    100 deg

    Approximate

  • Vertical Deflection Angle

    83 deg

    Approximate

  • Diagonal Deflection Angle

    114 deg

    Approximate

  • Phosphor

    Aluminized P4 text

  • Fluorescence

    White text

  • Persistence

    Short to Medium text

  • Light Transmittance

    75 percent

    Approximate

  • Cathode-to-All Capacitance

    5 pF

    Approximate

  • Grid1-to-All Capacitance

    6 pF

    Approximate

  • External Coating-to-Anode Capacitance Minimum

    1700 pF

  • External Coating-to-Anode Capacitance Maximum

    2500 pF

Other

  • Maximum Anode Voltage

    22000 V

  • Minimum Anode Voltage

    11000 V

  • Maximum Grid2 Voltage

    550 V

  • Maximum Heater-Cathode Voltage During Warmup

    450 V

    Duration<=15s

  • Maximum Heater-Cathode Voltage After Warmup

    200 V

  • Typical Anode Voltage

    18000 V

  • Typical Grid2 Voltage

    400 V

  • Focus Voltage Minimum

    0 V

  • Focus Voltage Maximum

    400 V

  • Cutoff Voltage Minimum

    -94 V

  • Cutoff Voltage Maximum

    -46 V

  • Maximum Grid1 Circuit Resistance

    1.5 Mohm

  • Drive Mode

    Grid Drive text