Skip to main content
Tube Tinker — Electron Tube Database
Alternatives & variationsDownload PDF datasheet

Specialized - Cathode Ray ·CathodeRay

9JP1

Nine-inch high-vacuum instrument CRT with electrostatic focusing, combined electrostatic and magnetic deflection, and a P1 green medium-persistence screen for precision direct-view waveform or indicator display.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
Sections
1
Base
-
Socket code
-
Base pins
-
Nominal heater
2.5 V / 2.1 A

Description

Nine-inch high-vacuum cathode-ray tube with electrostatic focus and combined electrostatic/magnetic deflection, using a medium-persistence P1 screen.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
-
Base pins
-
Nominal heater voltage
2.5 V
Nominal heater current
2.1 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
5000 V

Published ratings and characteristics promoted where clearly applicable; additional published values retained as 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

1940 RCA

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Characteristics

  • Heater or filament voltage

    2.5 V

    Published nominal value

  • Heater or filament current

    2.1 A

    Published nominal value

  • Focusing method

    Electrostatic

    Published

  • Deflection method

    Electrostatic and magnetic

    Published

  • Phosphor

    P1

    Medium-persistence green screen

Other

  • Anode No.2 maximum voltage

    5000 V

    High-voltage electrode

  • Anode No.1 maximum voltage

    2000 V

    Focusing electrode

  • Peak voltage between anode No.2 and either deflecting electrode

    3000 V

    Published