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31E14

Fourteen-inch rectangular cathode-ray tube for television studio monitoring, using low-voltage electrostatic focus and 70-degree magnetic deflection. Manufacturer documentation warns that X-ray shielding may be necessary above 16 kV.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

Sections: 1
Base: B12A
Socket code: -
Base pins: 12
Nominal heater: 6.3 V / 300 mA

Description

A 14-inch diagonal rectangular cathode-ray tube with 70-degree magnetic deflection and low-voltage electrostatic focusing, intended for television studio monitoring equipment. The datasheet warns that X-ray shielding may be necessary above 16 kV.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: B12A
Socket code: -
Base pins: 12
Nominal heater voltage: 6.3 V
Nominal heater current: 300 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

B12A - 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: 16000 V

CRT electrode ratings and operating 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

1961 AEI Industrial Valves

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Other

MaximumSecondFourthAnodeVoltage
16 kV
DesignCentre; absolute maximum 20 kV
MinimumSecondFourthAnodeVoltage
10 kV
MaximumThirdAnodeVoltage
-500 to 500 V
MaximumFirstAnodeVoltage
500 V
Maximum Heater Cathode Voltage
180 V
HeaterNegative DC
Maximum Peak Heater Cathode Voltage
400 V
HeaterNegative; warming-up period not exceeding one minute
TypicalSecondFourthAnodeVoltage
12 kV
TypicalFirstAnodeVoltage
300 V
TypicalThirdAnodeFocusVoltage
-300 to 300 V
Focus range
GridBiasCutoff
-72 to -30 V
Raster cut-off
PeakToPeakModulatingVoltage
24 V
Modulation up to 150 uA

Characteristic

Grid To All Other Electrodes Capacitance
9 pF
Includes CRT92/7 holder
Cathode To All Other Electrodes Capacitance
7 pF
Includes CRT92/7 holder
SecondFourthAnodeToExternalCoatingCapacitance
1300 pF
Approximate; includes CRT92/7 holder
Deflection Angle
70 degree
Magnetic deflection
ScreenDiagonal
14 in
Rectangular face

Data set 02

1961 Associated Electrical Industries

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Other

MinimumSecondFourthAnodeVoltage
10 kV
MaximumThirdAnodeVoltage
500 V
MaximumFirstAnodeVoltage
500 V
Maximum Heater Cathode Voltage
180 V
HeaterNegative
Peak Heater Cathode Voltage
400 V
WarmupMaximum1Minute
TypicalSecondFourthAnodeVoltage
12 kV

Characteristics

GridAllCapacitance
90 pF
CathodeAllCapacitance
70 pF