Skip to main content
Tube Tinker — Electron Tube Database
Alternatives & variationsDownload PDF datasheet

Specialized - Cathode Ray ·CathodeRay

24CP4

Twenty-four-inch direct-view monochrome television picture tube with a P4 screen and magnetic deflection. Manufacturer documentation provides the high-voltage operating, focusing, optical, and capacitance characteristics required for receiver display service.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
Sections
1
Base
12N
Socket code
DUODECAL5
Base pins
5
Nominal heater
6.3 V / 600 mA

Description

Direct-view cathode-ray picture tube intended for television display service. The supplied Tung-Sol datasheet provides electrical ratings, operating conditions, capacitances, optical characteristics, focusing and deflection information. Features an aluminized screen where specified by this designation.

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
12N
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

12N - 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
20000 V
Max screen voltage
500 V

CRT electrode, focus, deflection and optical data preserved in parameter rows.

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

Characteristics

  • Phosphor

    P4

  • Deflection method

    Magnetic

  • Focusing method

    Electrostatic

Data set 02

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Other

  • Maximum Anode Voltage

    20000 V

  • Typical Anode Voltage

    18000 V

  • Maximum Grid2 Voltage

    500 V

  • Typical Grid2 Voltage

    300 V

Characteristic

  • FocusingMethod

    Magnetic

  • DeflectingMethod

    Magnetic

  • DiagonalDeflectionAngleApproximate

    90 degree

  • PhosphorNumber

    4

  • FluorescentColor

    White

Data set 03

1965 Sylvania Electronic Tubes Vol3

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Other

  • Maximum Grid No. 2 voltage

    500 V

    Published maximum Grid No. 2 voltage

  • Maximum anode voltage

    20000 V

    Published maximum anode voltage

  • Anode voltage

    20000 V

    Anode voltage .............. . 20,000 Volts dc

  • Grid No. 2 Voltage

    500 V

    Grid No. 2 Voltage ....... . . 500 Volts dc

  • During Warm-up Period Not to Exceed

    15 s

    During Warm-up Period Not to Exceed 15 Seconds . 410 Volts

  • After Equipment warm-up period

    180 V

    After Equipment warm-up period ..... 180 Volts

  • Heater Positive with Respect to Cathode

    180 V

    Heater Positive with Respect to Cathode . . . 180 Volts

  • Anodevoltage

    18000 V

    Anodevoltage. . . . . 18,000 Volts dc

  • Grid No. 2 Voltage

    300 V

    Grid No. 2 Voltage . . . . 300 Volts dc

  • Grid No. 1 Voltage Required for Cutoff2 . -28 to

    -72 V

    Grid No. 1 Voltage Required for Cutoff2 . -28 to -72 Volts dc

  • Ion Trap Magnet Strength (approx.)

    40 G

    Ion Trap Magnet Strength (approx.) . . . . . . 40 Gausses

Characteristic

  • Light Transmittance (approx.)

    68 %

    Light Transmittance (approx.) ..... 68 Percent

CircuitValue

  • Grid No.1 Circuit.Resistance

    1.5 Mohm

    Grid No.1 Circuit.Resistance ...... . 1.5 Megohms Max.

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

  • MAGNETIC FOCUS AND DEFLECTION — value 1

    161

    Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.

  • MAGNETIC FOCUS AND DEFLECTION — value 2

    211

    Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.

  • RECTANGULAR Gt.ASS CONSTRUCTION

    10

    Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.

  • DIRECT INTERELECTRODE CAPACITANCES (APPROX.J

    1

    Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.

  • GRID #1 TO AL1,. OTHER ELECTRODES — value 1

    1

    Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.

  • GRID #1 TO AL1,. OTHER ELECTRODES — value 2

    0

    Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.

  • GRID #1 TO AL1,. OTHER ELECTRODES — value 3

    1111

    Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.

  • MINIMUM EXTERNAL CONDUCTIVE COATING TO ANODE

    500

    Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.

  • F gCEPLATE LIGHT TRANSMISSION — value 1

    11 percent

    Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.

  • F gCEPLATE LIGHT TRANSMISSION — value 2

    3 percent

    Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.

  • PIN gp - GRID NO. 2

    2

    Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.

  • HEATER CURRENT

    0 mA

    Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.

  • HEATER POSITIVE WITH RESPECT TO CATHODE — value 1

    1 V

    Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.

  • HEATER POSITIVE WITH RESPECT TO CATHODE — value 2

    0 V

    Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.

  • DC ANODE IGRID #3 VOLTAGE — value 1

    1 V

    Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.

  • DC ANODE IGRID #3 VOLTAGE — value 2

    3 V

    Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.

  • DC ANODE IGRID #3 VOLTAGE — value 3

    0 V

    Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.

  • DC GRID #2 VOLTAGE

    2 V

    Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.

  • DC GRID #i VOLTA GE B

    1 V

    Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.

  • DC FOCUSING COIL CURRENT (APPROX.J C — value 1

    115 mA

    Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.

  • DC FOCUSING COIL CURRENT (APPROX.J C — value 2

    20 mA

    Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.

  • DC ION TRAP CURRENT STANDARD COIL #iii (APPROX.J — value 1

    111 mA

    Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.

  • DC ION TRAP CURRENT STANDARD COIL #iii (APPROX.J — value 2

    100 mA

    Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.

  • DC ION TRAP CURRENT STANDARD COIL #iii (APPROX.J — value 3

    50 mA

    Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.

  • B VI SU AI E%TI MCTI OM OF UXDEFL ECTEO FOCUSED SPOT. — value 1

    0

    Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.

  • B VI SU AI E%TI MCTI OM OF UXDEFL ECTEO FOCUSED SPOT. — value 2

    0

    Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.

  • DFOR STANDARD FOCUS COIL f109, OR EOUI VAL EM T, WITX THE COYBI MED GRID fl BIAS VOI TAGE AND YIDEO — value 1

    9

    Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.

  • DFOR STANDARD FOCUS COIL f109, OR EOUI VAL EM T, WITX THE COYBI MED GRID fl BIAS VOI TAGE AND YIDEO — value 2

    0

    Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.

  • SIGNAL VOLTAGE ADJUSTED TO PROOU CE A NI GNLIGMT BRIGNTMESS OF j0 FOOT LAYBEfl TS ON A 21 1/4" BT — value 1

    0 V

    Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.

  • SIGNAL VOLTAGE ADJUSTED TO PROOU CE A NI GNLIGMT BRIGNTMESS OF j0 FOOT LAYBEfl TS ON A 21 1/4" BT — value 2

    211 V

    Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.

  • SIGNAL VOLTAGE ADJUSTED TO PROOU CE A NI GNLIGMT BRIGNTMESS OF j0 FOOT LAYBEfl TS ON A 21 1/4" BT — value 3

    4 V

    Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.

  • 16 7/4" PICTURE SI ZEr DISTANCE FROM REFERENCE LIME TO CENTER OF AIR GAP OM FOCUS COIL SNAIL — value 1

    11

    Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.

  • 16 7/4" PICTURE SI ZEr DISTANCE FROM REFERENCE LIME TO CENTER OF AIR GAP OM FOCUS COIL SNAIL — value 2

    0

    Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.

  • 16 7/4" PICTURE SI ZEr DISTANCE FROM REFERENCE LIME TO CENTER OF AIR GAP OM FOCUS COIL SNAIL — value 3

    0

    Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.

Other

  • MAXIMUM EXTERNAL CONDUCTIVE COATING TO ANODE

    7

    Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.

  • MAXIMUM DC ANODE S GRID #} VOLTAGE

    20000 V

    Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.

  • MAXIMUM DC GRID #2 VOI TAGE — value 1

    2 V

    Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.

  • MAXIMUM DC GRID #2 VOI TAGE — value 2

    500 V

    Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.

  • MAXIMUM GRID #1 VOLTAGE

    1 V

    Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.

  • MAXIMUM GRID #i CIRCUIT RESISTANCE — value 1

    1

    Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.

  • MAXIMUM GRID #i CIRCUIT RESISTANCE — value 2

    0

    Published CRT datasheet value; multiple values on one source row represent separate conditions, limits, or nominal values.