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

3DP1A

Compact electrostatically focused and deflected cathode-ray instrument tube intended for waveform and measurement display, with manufacturer-specified accelerating, focusing, and deflection-electrode ratings.

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

Description

Three-inch radial-deflection cathode-ray tube with electrostatic focus and deflection for observing and photographing recurrent or transient phenomena in polar coordinates.

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
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
2200 V

Published ratings and characteristics promoted where clearly stated; remaining 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

    6.3 V

    Published nominal value

  • Heater or filament current

    600 mA

    Published nominal value

  • Deflection method

    Electrostatic

    Published

  • Focusing method

    Electrostatic

    Published

Other

  • Anode No.2 and grid No.2 maximum voltage

    2200 V

    Absolute maximum

  • Anode No.1 maximum voltage

    1100 V

    Absolute maximum

  • Maximum voltage between anode No.2 and any deflection electrode

    550 V

    Published