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

12BKP4

Cathode-ray display tube documented by manufacturer data for type 12BKP4; available extracted source information is sparse, so no more specialized application or construction claim is made.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
Sections
1
Base
-
Socket code
-
Base pins
-
Nominal heater
6.3 V / 450 mA

Description

Twelve-inch monochrome television picture tube with low-voltage electrostatic focus and 110-degree magnetic deflection.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
-
Base pins
-
Nominal heater voltage
6.3 V
Nominal heater current
450 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
15000 V

Published Westinghouse ratings, characteristics, typical operating conditions, and capacitances extracted from supplied source.

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 Westinghouse Data Book

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Characteristic

  • Heater Voltage

    6.3 V

  • Heater Current

    450 mA

  • ControlledWarmupHeater

    1 boolean

  • Heater Warmup Time

    11 s

  • FocusingMethod

    LowVoltageElectrostatic

  • DeflectionMethod

    Magnetic

  • DeflectionAngleDiagonal

    110 degree

  • DeflectionAngleHorizontal

    99 degree

  • DeflectionAngleVertical

    80 degree

  • Phosphor

    Aluminized P4

  • Cathode To All Capacitance

    5 pF

  • Grid1 To All Capacitance

    6 pF

  • ExternalCoatingToAnodeCapacitanceMinimum

    500 pF

  • ExternalCoatingToAnodeCapacitanceMaximum

    800 pF

  • UsefulScreenHorizontal

    10.125 in

  • UsefulScreenVertical

    7.625 in

Other

  • AnodeVoltageMaximum

    15000 V

  • AnodeVoltageMinimum

    9000 V

  • FocusElectrodeVoltageMinimum

    -550 V

  • FocusElectrodeVoltageMaximum

    1100 V

  • Grid2VoltageMaximum

    70 V

  • Grid2VoltageMinimum

    20 V

  • Heater Voltage Minimum

    5.67 V

  • Heater Voltage Maximum

    6.93 V

  • HeaterCathodeVoltageMaximum

    450 V

    Warmup<=15s;HeaterNegative

  • HeaterCathodeVoltageMaximum

    200 V

    AfterWarmup

  • Grid1CircuitResistanceMaximum

    1.5 Mohm

  • Grid2And4CircuitResistanceMinimum

    10000 ohm

  • Anode Voltage

    12000 V

  • FocusElectrodeVoltage

    0 to 400 V

  • Grid2 Voltage

    50 V

  • CathodeVoltageForRasterCutoff

    35 to 55 V