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

5CP12

Five-inch special-purpose direct-view oscilloscope CRT with electrostatic focusing and deflection plus post-deflection acceleration. Its P12 orange long-persistence screen provides extended trace visibility.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
Sections
1
Base
-
Socket code
DIHEPTAL12
Base pins
-
Nominal heater
6.3 V / 600 mA

Description

Five-inch special-purpose direct-view CRT with electrostatic focus/deflection and post-deflection acceleration.

Socket description

Medium-shell Diheptal 12-contact CRT base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
DIHEPTAL12
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

No fixed ratings are recorded for this section.

CRT electron-gun/display section.

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

  • Heater Voltage

    6.3 V

  • Heater Current

    600 mA

    Approximate

  • Focusing Method

    Electrostatic text

  • Deflection Method

    Electrostatic text

  • Fluorescence

    Orange text

  • Persistence

    Medium Long text

  • Cathode-to-All Capacitance

    9 pF

    Approximate

  • Grid1-to-All Capacitance

    8 pF

    Approximate

  • Deflection Plates 1-2 Capacitance

    2 pF

    Approximate

  • Deflection Plates 3-4 Capacitance

    2 pF

    Approximate

  • Deflecting Plate 1-to-All Capacitance

    9 pF

    Approximate

  • Deflecting Plate 2-to-All Capacitance

    9 pF

    Approximate

  • Deflecting Plate 3-to-All Capacitance

    7 pF

    Approximate

  • Deflecting Plate 4-to-All Capacitance

    8 pF

    Approximate

Other

  • Maximum Anode3 Voltage

    4000 V

  • Maximum Anode2 Voltage

    2000 V

  • Maximum Anode1 Voltage

    1000 V

  • Maximum Grid1 Negative Bias

    200 V

  • Maximum Grid1 Positive Peak

    2 V

  • Maximum Heater-Cathode Voltage

    125 V

    EitherPolarity

  • Maximum Anode2-to-Deflection-Plate Voltage

    500 V

  • Anode3 Voltage

    4000 V

  • Anode2 Voltage

    2000 V

  • Focus Voltage Minimum

    375 V

    Anode1

  • Focus Voltage Maximum

    690 V

    Anode1

  • Grid1 Cutoff Voltage Minimum

    -90 V

  • Grid1 Cutoff Voltage Maximum

    -30 V

  • Deflection Factor Plates 1-2

    92 V/in

  • Deflection Factor Plates 3-4

    78 V/in

  • Maximum Grid1 Circuit Resistance

    1.5 Mohm

  • Maximum Deflection Circuit Resistance

    5 Mohm