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

23FNP4

Large aluminized P4 monochrome television picture tube for high-voltage direct-view service, using electrostatic focusing and magnetic deflection with manufacturer-specified operating characteristics for type 23FNP4.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
Sections
1
Base
-
Socket code
B12C
Base pins
-
Nominal heater
6.3 V / 600 mA

Description

23-inch 92-degree filled-rim monochrome television CRT with integral mounting holes.

Socket description

Duodecar 12-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
B12C
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
25000 V

Published CRT maximum ratings, operating conditions, capacitances, and deflection/focus data retained; X-ray precautions apply at elevated EHT.

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

1964 RMA EIA

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

  • Vertical deflection angle

    66 deg

  • Diagonal deflection angle

    92 deg

  • Heater voltage

    6.3 V

  • Heater current

    600 mA

Capacitance

  • Cathode-to-all capacitance

    5 pF

  • Grid1-to-all capacitance

    6 pF

  • External coating capacitance minimum

    2000 pF

  • External coating capacitance maximum

    2500 pF

Other

  • Anode voltage maximum

    25000 V

  • Anode voltage minimum

    16000 V

  • Typical anode voltage

    20000 V

Application

  • Application

    Monochrome television picture display