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31E13

Twelve-inch flat-face aluminized cathode-ray tube primarily designed for radar PPI applications. Magnetic focus and deflection combine with T6 or T7 long-afterglow screens to retain plotted radar information.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

Sections: 1
Base: B12A
Socket code: -
Base pins: 12
Nominal heater: 6.3 V / 600 mA

Description

Magnetically focused and deflected 12-inch flat-face aluminised cathode-ray tube primarily designed for PPI applications, available with T6 or T7 long-afterglow screens and conforming to British Service specification CV429.

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: 600 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: 15500 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

MaximumSecondAnodeVoltage
15.5 kV
Absolute maximum
MinimumSecondAnodeVoltage
9 kV
MaximumFirstAnodeVoltage
600 V
Absolute maximum
Maximum Heater Cathode Voltage
150 V
HeaterNegative DC
TypicalSecondAnodeVoltage
15 kV
TypicalFirstAnodeVoltage
300 V
GridBiasCutoff
-90 to -60 V
PeakToPeakModulatingVoltage
24 V
Modulation up to 50 uA

Characteristic

Grid Earth Capacitance
- to 8 pF
With holder capacity balanced out
CathodeEarthCapacitance
- to 8 pF
With holder capacity balanced out
MaximumSpotDeviation
- to 15 mm
Unfocused and undeflected spot from screen centre
MaximumUnfocusedSpotDiameter
- to 15 mm
50 uA beam current
MaximumLineWidth
- to 0.5 mm
50 uA beam current
T6ScreenPersistence
50 s
Long yellow afterglow
T7ScreenPersistence
200 s
Very long orange afterglow
UsefulScreenDiameter
265 to - mm

Data set 02

1961 Associated Electrical Industries

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Other

MinimumSecondAnodeVoltage
9 kV
MaximumFirstAnodeVoltage
600 V
Maximum Heater Cathode Voltage
150 V
HeaterNegative
TypicalSecondAnodeVoltage
15 kV
TypicalFirstAnodeVoltage
300 V
Grid Earth Capacitance
8 pF
Maximum
CathodeEarthCapacitance
8 pF
Maximum