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Specialized - Cathode Ray ·CathodeRay

21CBP4

Large P4 monochrome television picture tube documented for high-voltage direct-view service, using magnetic deflection and manufacturer-specified focusing and beam-control arrangements for type 21CBP4.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
Sections
1
Base
-
Socket code
DUODECAL5
Base pins
5
Nominal heater
6.3 V / 600 mA

Description

Direct-view cathode-ray picture tube for television display service. Electrical ratings, operating conditions, capacitances, optical data, and construction details were extracted from the supplied datasheet.

Socket description

Small-shell Duodecal 5-contact CRT base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
DUODECAL5
Base pins
5
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
22000 V
Max screen voltage
550 V

Published Sylvania high-voltage CRT ratings and typical operating conditions promoted/extracted from supplied datasheet.

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 Tung Sol

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

  • Maximum anode voltage

    18000 V

  • Maximum grid 2 voltage

    550 V

  • Typical anode voltage

    14000 V

    Typical operating conditions

  • Typical grid 2 voltage

    550 V

    Typical operating conditions

Characteristic

  • Vertical deflection angle

    68 deg

Capacitance

  • Cathode to all other electrodes

    5 pF

    Approximate

  • Grid 1 to all other electrodes

    4 pF

    Approximate

Data set 02

1965 Sylvania Electronic Tubes Vol3

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Characteristic

  • Heater Voltage

    6.3 V

  • Heater Current

    600 mA

  • FocusingMethod

    Electrostatic

  • DeflectionMethod

    Magnetic

  • Phosphor

    Aluminized P4 white

  • DeflectionAngles

    large-angle magnetic

  • Cathode To All Capacitance

    5 pF

  • Grid1 To All Capacitance

    6 pF

  • ExternalConductiveCoatingToAnodeCapacitanceMaximum

    2500 pF

  • ExternalConductiveCoatingToAnodeCapacitanceMinimum

    2000 pF

Other

  • AnodeVoltageMaximum

    22000 V

  • AnodeVoltageMinimum

    10000 V

  • FocusingElectrodeVoltageRangeMaximum

    -550 to +1100 V

  • Grid2VoltageMaximum

    550 V

  • Grid2VoltageMinimum

    200 V

  • Grid1NegativeBiasMagnitudeMaximum

    155 V

  • Grid1PositivePeakVoltageMaximum

    2 V

  • HeaterCathodeVoltageMaximum

    450 V

    Warmup<=15s;HeaterNegative

  • HeaterCathodeVoltageMaximum

    200 V

    AfterWarmup

  • HeaterCathodeVoltageMaximum

    200 V

    HeaterPositive

  • Anode Voltage

    16000 V

  • FocusingElectrodeVoltage

    -50 to +350 V

  • Grid1VoltageForCutoff

    -28 to -72 V

  • Grid1CircuitResistanceMaximum

    1.5 Mohm

Data set 03

1965 Westinghouse Data Book

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Characteristics

  • Heater Voltage

    6.3 V

  • Heater Current

    600 mA

  • Heater Warm-up Time

    11 s

  • Focusing Method

    Low Voltage Electrostatic text

  • Deflection Method

    Magnetic text

  • Horizontal Deflection Angle

    85 deg

    Approximate

  • Vertical Deflection Angle

    68 deg

    Approximate

  • Diagonal Deflection Angle

    90 deg

    Approximate

  • Phosphor

    Aluminized P4 text

  • Fluorescence

    White text

  • Persistence

    Short to Medium text

  • Light Transmittance

    73 percent

    Approximate

  • Cathode-to-All Capacitance

    5 pF

    Approximate

  • Grid1-to-All Capacitance

    6 pF

    Approximate

  • External Coating-to-Anode Capacitance Minimum

    2000 pF

  • External Coating-to-Anode Capacitance Maximum

    2500 pF

Other

  • Maximum Anode Voltage

    18000 V

  • Minimum Anode Voltage

    11000 V

  • Maximum Focus Electrode Voltage Positive

    1100 V

    Grid4

  • Maximum Focus Electrode Voltage Negative

    -550 V

    Grid4

  • Maximum Grid2 Voltage

    500 V

  • Minimum Grid2 Voltage

    200 V

  • Maximum Heater-Cathode Voltage During Warmup

    450 V

    Duration<=15s

  • Maximum Heater-Cathode Voltage After Warmup

    180 V

  • Typical Anode Voltage

    14000 V

    CathodeDrive

  • Typical Focus Voltage Minimum

    0 V

    Grid4

  • Typical Focus Voltage Maximum

    400 V

    Grid4

  • Typical Grid2 Voltage

    300 V

    CathodeDrive

  • Cathode Voltage for Raster Cutoff Minimum

    28 V

    CathodeDrive

  • Cathode Voltage for Raster Cutoff Maximum

    72 V

    CathodeDrive

  • Maximum Grid1 Circuit Resistance

    1.5 Mohm

Data set 04

1966 Tung Sol Electronic Tubes 4 of 4

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Characteristics

  • 19 1/16" X iS 1/16" RASTER SIZE — value 1

    16

    Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.

  • 19 1/16" X iS 1/16" RASTER SIZE — value 2

    1

    Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.

  • 19 1/16" X iS 1/16" RASTER SIZE — value 3

    16

    Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.

  • GRID #1 TO ALL OTHER ELECTRODES

    1

    Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.

  • HEATER VOLTAGE

    6.3 V

    Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.

  • HEATER CURRENT — value 1

    0.6

    Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.

  • HEATER CURRENT — value 2

    10

    Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.

  • HEATER CURRENT — value 3

    6

    Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.

  • HEATER POSITIVE WITH RESPECT TO CATHODE

    180 V

    Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.

  • DC GRID #4 VOLTAGE — value 1

    4 V

    Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.

  • DC GRID #4 VOLTAGE — value 2

    55 V

    Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.

  • DC GRID #4 VOLTAGE — value 3

    300 V

    Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.

  • DC GRID #2 VOLTAGE — value 1

    2 V

    Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.

  • DC GRID #2 VOLTAGE — value 2

    3 V

    Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.

  • DC GRID #1 VOITAGE A — value 1

    1 V

    Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.

  • DC GRID #1 VOITAGE A — value 2

    28 V

    Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.

  • DC GRID #1 VOITAGE A — value 3

    72 V

    Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.

Other

  • MAXIMUM EXTERNAL CONDUCTIVE COATING TO ANODE

    2500 mA

    Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.

  • MAXIMUM DC ANODE VOLTAGE

    18 V

    Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.

  • MAXIMUM DC GRID #4 VOLTAGE — value 1

    4 V

    Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.

  • MAXIMUM DC GRID #4 VOLTAGE — value 2

    500 V

    Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.

  • MAXIMUM DC GRID #4 VOLTAGE — value 3

    1000 V

    Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.

  • MAXIMUM DC GRID #2 VOLTAGE — value 1

    2 V

    Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.

  • MAXIMUM DC GRID #2 VOLTAGE — value 2

    550 V

    Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.

  • MAXIMUM GRID #1 VOLTAGE

    1 V

    Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.

  • MAXIMUM GRID #i CIRCUIT RESISTANCE

    1.5 mA

    Published CRT datasheet value; multiple values on a row correspond to separate source-table conditions or limits.