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

23BTP4

Twenty-three-inch direct-view monochrome television picture tube with electrostatic focusing, magnetic deflection, and an aluminized P4 screen. Manufacturer documentation places it in the high-voltage receiver CRT family used for bright rectangular picture presentation.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
Sections
1
Base
-
Socket code
NEOEIGHTAR7
Base pins
-
Nominal heater
6.3 V / 20 A

Description

23-inch direct-view monochrome television CRT with electrostatic focus, magnetic deflection, aluminized P4 screen, and gray/filter faceplate construction.

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
20 A
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

CRT-specific ratings, operating conditions, capacitances, focus/deflection, cutoff, optical, and screen data are retained in section parameters.

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

  • Focusing method

    Electrostatic

  • Deflection method

    Magnetic

  • Horizontal deflection angle

    81 deg

  • Diagonal deflection angle

    92 deg

  • Vertical deflection angle

    67 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

    500 V

  • Cutoff voltage range

    -35 to -72 V

  • Grid1 circuit resistance maximum

    1.5 Mohm

  • 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 02

1971 RCA HB3 Binder 1 of 7

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Characteristics

  • LOW-VOLTAGE ELECTROSTATIC FOCUS

    92 V

    Published CRT datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • LOW-VOLTAGE ELECTROSTATIC FOCUS

    10 V

    Published CRT datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • Heater Current at 6.3 volts — published value 1

    6.3 V

    Published CRT datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • Heater Current at 6.3 volts — published value 2

    450 V

    Published CRT datasheet value; multiple numbers on one source row represent separate limits or operating conditions.

  • Heater Current at 6.3 volts — published value 3

    20 V

    Published CRT datasheet value; multiple numbers on one source row represent separate limits or operating conditions.