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Specialized - Cathode Ray ·CathodeRay

5CP1A

Five-inch post-deflection-acceleration oscilloscope CRT with electrostatic focusing and deflection. Designed for high-brightness oscillographic display, it combines precise electrostatic beam control with increased final acceleration.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
Sections
1
Base
612-37
Socket code
DUODECAL11
Base pins
12
Nominal heater
6.3 V / 600 mA

Description

5-inch post-deflection-acceleration electrostatic-focus and electrostatic-deflection cathode-ray tube for high-brightness oscillographic display.

Socket description

Duodecal 11-contact CRT base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
612-37
Socket code
DUODECAL11
Base pins
12
Nominal heater voltage
6.3 V
Nominal heater current
600 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

612-37 - 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
4000 V

CRT maximum accelerating/anode/ultor voltage is promoted to MaxPlateVoltage; additional electrode ratings, capacitances, operating conditions, deflection/focus and optical data are preserved as 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

1950 Sylvania

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Other

  • Heater Voltage

    6.3 V

    Nominal

  • Heater Current

    600 mA

    Nominal

Data set 02

1960 Du Mont

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Characteristics

  • Focusing method

    1 code

    Electrostatic

  • Deflection method

    1 code

    Electrostatic

  • Deflection factor D1-D2

    -

    Published range 78 to 106 V/in

  • Minimum useful screen

    414 in

Other

  • Accelerator voltage maximum

    4000 V

  • Accelerator voltage

    2000 V

  • Post-accelerator voltage maximum

    4000 V

  • Post-accelerator voltage

    4000 V

  • Grid No. 1 voltage

    -

    Published range -90 to -30 V

  • Grid No. 1 negative bias maximum

    200 V

Capacitance

  • Cathode to all other electrodes

    9 pF

    Approximate or first published bound

  • Grid No. 1 to all other electrodes

    8 pF

    Approximate or first published bound

Data set 03

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

    Green text

  • Persistence

    Medium 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

Data set 04

1971 RCA HB3 Binder 1 of 7

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Other

  • Maximum anode 2 voltage

    2000 V

  • Maximum anode 1 voltage

    1000 V

  • Peak heater-cathode voltage

    125 V

    HeaterNegative

  • Peak heater-cathode voltage

    125 V

    HeaterPositive

  • Maximum accelerating/anode voltage

    4000 V

  • ANODE-No.3 VOLTAGE

    4000 V

    Maximum

  • ANODE-No.2' VOLTAGE

    2000 V

    Maximum

  • ANODE-No.l VOLTAGE

    1000 V

    Maximum

  • ANY DEFLECTING ELECTRODE

    500 V

    Maximum

  • Grid-No.l-Circuit Resistance 1

    5 MΩ

    Maximum

  • '~ It is recommended that anode-x0.3 voltage De not less Loan

    3000 V

Capacitance

  • Grid 1 to all other electrodes capacitance

    8 pF

    Approximate

  • Cathode to all other electrodes capacitance

    9 pF

    Approximate

Characteristic

  • Grid No.1 to All Other Electrodes

    8 pF

  • Cathode to All Other Electrodes

    9 pF

  • DJ1 to All Other Electrodes

    9 pF

  • 0.12 to All Other Electrodes

    9 pF

  • DJ3 to All Other Electrodes

    7 pF

  • DJ4 to All Other Electrodes

    8 pF