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Specialized - Cathode Ray ·CathodeRay

4RP1

Rectangular flat-face oscilloscope CRT with electrostatic focusing and deflection for compact transistorized equipment. It incorporates a linear post-accelerator and geometry-adjust electrode for bright, accurately shaped traces.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
Sections
1
Base
-
Socket code
B12A
Base pins
-
Nominal heater
6.3 V / 300 mA

Description

The ETC 4RP1 is a rectangular flat-face electrostatic-focus and deflection cathode-ray tube for compact transistorized equipment, featuring a linear post-accelerator and geometry-adjust electrode.

Socket description

Duodecal 12-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
B12A
Base pins
-
Nominal heater voltage
6.3 V
Nominal heater current
300 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.

Cathode-ray electron-gun section; CRT-specific ratings are retained in TUBE_SECTION_PARAMETER because fixed plate/screen fields are not semantically equivalent.

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

1961 Electronic Tube Corp

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Other

  • Heater voltage

    6.3 V

  • Heater current nominal

    300 mA

  • Maximum post-accelerator voltage

    3400 V

  • Maximum accelerator voltage

    650 V

  • Maximum focusing voltage

    100 V

  • Maximum accelerator-to-deflection-electrode voltage

    200 V

  • Maximum negative grid-1 bias magnitude

    200 V

  • Maximum positive grid-1 bias

    0 V

  • Maximum heater-to-cathode voltage magnitude

    180 V

  • Typical post-accelerator voltage

    3000 V

  • Typical accelerator voltage

    600 V

  • Typical focusing voltage

    40 to 160 V

  • Typical grid-1 voltage

    -50 to -30 V

  • Typical post-accelerator current

    40 uA

  • Deflection factor D1-D2 minimum

    25 V/in

  • Deflection factor D1-D2 maximum

    30 V/in

  • Deflection factor D3-D4 minimum

    12.5 V/in

  • Deflection factor D3-D4 maximum

    15.5 V/in

Construction

  • Focusing method

    Electrostatic

  • Deflecting method

    Electrostatic

  • Electron gun / beam count

    1

Characteristic

  • Phosphor options

    P1,P2,P7,P11

Capacitance

  • Cathode to all other electrodes

    5.3 pF

  • Grid 1 to all other electrodes

    6.8 pF