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

21BSP4

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 21BSP4.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
Sections
1
Base
-
Socket code
B12D
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

Duodecar 12-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
B12D
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
22 V
Max screen voltage
550 V

Published CRT ratings, operating conditions, capacitances, optical and deflection data are retained 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

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

    22000 V

  • Maximum grid 2 voltage

    550 V

  • Typical anode voltage

    22000 V

    Typical operating conditions

  • Typical grid 2 voltage

    550 V

    Typical operating conditions

Characteristic

  • Heater warm-up time

    11 s

Capacitance

  • Cathode to all other electrodes

    5 pF

    Approximate

  • Grid 1 to all other electrodes

    6 pF

    Approximate

Data set 02

1966 Tung Sol Electronic Tubes 4 of 4

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Characteristics

  • GRID #1 TO ALL CTHER ELECTRODES — value 1

    1

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

  • GRID #1 TO ALL CTHER ELECTRODES — value 2

    6

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

  • MINIMUM EXTERNAL CONDUCTIVE COATING TO ANODE

    2000

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

  • HEATER

    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

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

  • HEATER CURRENT — value 2

    6

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

  • HEATER POSITIVE WI TN RESPECT TO CATHODE

    20 V

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

  • DC ANODE VOLTAGE

    16 V

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

  • OC GRID #2 VOLTAGE

    2 V

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

  • OC GRID #i VOLTAGE A

    -2 V

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

  • DC FOCUSING COIL CURRENT (APPROX.)B — value 1

    116 mA

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

  • DC FOCUSING COIL CURRENT (APPROX.)B — value 2

    15 mA

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

  • OC ION TRAP MAGNET STANDARD COIL #117 (APPROX.) — value 1

    117 mA

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

  • OC ION TRAP MAGNET STANDARD COIL #117 (APPROX.) — value 2

    3 mA

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

  • OC ION TRAP MAGNET RATED STRENGTH

    33 mA

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

  • Bf OR ST ANDA0.D FOCUS LOII 1109, OR EOUIYALE MT, wITN TnE COYBI NED GRID R1 BIAS VOLTAGE ARD ViDEO

    1109 V

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

  • SIGNAL VOLTAGE ADJUSTED TO PRODUCE A HIGHLIGHT BRIGHT NE 55 Of 2D f00T CAMBER TS ON A ly 1/16• BT — value 1

    2 V

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

  • SIGNAL VOLTAGE ADJUSTED TO PRODUCE A HIGHLIGHT BRIGHT NE 55 Of 2D f00T CAMBER TS ON A ly 1/16• BT — value 2

    1 V

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

  • SIGNAL VOLTAGE ADJUSTED TO PRODUCE A HIGHLIGHT BRIGHT NE 55 Of 2D f00T CAMBER TS ON A ly 1/16• BT — value 3

    16 V

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

Other

  • MAXIMUM E%TER NAL 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

    22 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 CIRCUIT RESISTANCE — value 1

    1 mA

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

  • MAXIMUM GRID #1 CIRCUIT RESISTANCE — value 2

    1.5 mA

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