Specialized - Cathode Ray ·CathodeRay
Thirty-one-centimeter radar cathode-ray tube with a metal-backed round screen, low-voltage electrostatic focusing, and magnetic deflection for direct-view radar display.
31 cm radar cathode-ray tube with metal-backed round screen, magnetic deflection, and low-voltage electrostatic focus.
Duodecal 7-contact CRT base
General specifications
Properties common to every published source and operating point.
Electrical assignments shared by every tube using this base designation.
No verified pinout is recorded for this base designation.
1 physical section, each with unique specifications.
Section 1
No fixed ratings are recorded for this section.
CRT-specific electrical, optical, deflection, focusing, capacitance, and mechanical data are retained in TUBE_SECTION_PARAMETER because the locked promoted fields primarily target conventional electrode sections.
Source-dependent data
Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.
Data set 01
Published operating points and test conditions from this source.
Heater Voltage
6.3 V
Heater Current
300 mA
DeflectionMethod
Magnetic
FocusMethod
Electrostatic
LowVoltage
Data set 02
Published operating points and test conditions from this source.
Screen color
Orange
RadarCRT
Focusing
Electrostatic
RadarCRT
Deflection
Double magnetic
RadarCRT
Screen persistence
Long
RadarCRT
Screen useful dimension
265 mm
RadarCRT
Final accelerator voltage
12 kV
RadarCRT
Grid No.2 voltage
300 V
RadarCRT
Heater voltage
6.3 V
RadarCRT
Heater current
300 mA
RadarCRT
Focusing grid voltage range
-200 to +200 V
RadarCRT
Grid No.1 extinction voltage
-30 to -70 V
RadarCRT
Data set 03
Published operating points and test conditions from this source.
Capacitances Cg <
8 pF
Capacitances Cg < 8 pF
Grid capacitance
8 pF
Capacitances Cg < 8 pF
Grid capacitance
8 pF
Kapazitaten Cg < 8 pF
of focus voltage the limit of
200 V
of focus voltage the limit of -200 to +200 V is such
a voltage of at least
300 V
a voltage of at least -300 to +300 V will be required
Heater current
300 mA
rallele If = 300 mA
Useful screen diameter
265 mm
Nachleuchtdauer lang Useful diameter Diametre utile 265 mm Nutzbarer Durchmesser For curves of the screen properties s
Screen-grid voltage
300 V
Vg2 = 300V
Control-grid voltage
-30 V
Vg1 = -30/-70 V4)
Data set 04
Published operating points and test conditions from this source.
Heater voltage
6.3 V
Heater current
300 mA
Useful screen diagonal/diameter
265 mm
Deflection method
Magnetic
Focusing method
Low-voltage electrostatic
Grid No.1 capacitance maximum
8 pF
Cathode capacitance maximum
8 pF
External coating capacitance
1200 pF