Data set 01
1961 Tung Sol
Published operating points and test conditions from this source.
SECTION 1
Cathode Ray
Other
HighVoltageAnodeMaximum
20000 V
CRT
Capacitance
CathodeToOtherElectrodesCapacitance
5 pF
Approximate
Specialized - Cathode Ray ·CathodeRay
21MP4
Twenty-one-inch direct-view television picture tube with low-voltage electrostatic focus, magnetic deflection, external single-field ion trap, and white P4 medium-persistence screen. Approximately 70-degree deflection supports conventional monochrome receiver construction.
Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
- Sections
- 1
- Base
- 12M
- Socket code
- B12D
- Base pins
- 12
- Nominal heater
- 6.3 V / 600 mA
Description
Direct-view television picture tube with low-voltage electrostatic focus, magnetic deflection, external single-field ion trap, and P4 white phosphor.
Socket description
Duodecar 12-contact
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- 12M
- Socket code
- B12D
- Base pins
- 12
- Nominal heater voltage
- 6.3 V
- Nominal heater current
- 600 mA
- Parallel heater voltage
- -
- Parallel heater current
- -
- Series capable
- No
12M - 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
- Max screen voltage
- 500 V
Maximum anode voltage mapped to MaxPlateVoltage; CRT grid/focusing limits retained as parameters rather than mis-promoted as ordinary screen-grid data.
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 02
1966 Tung Sol Electronic Tubes 4 of 4
Published operating points and test conditions from this source.
SECTION 1
Cathode Ray
Construction
Focusing method
LowVoltageElectrostatic
Deflecting method
Magnetic
Phosphor
P4
White;MediumPersistence
Characteristic
Deflection angle
70 deg
Approximate
Faceplate light transmission at center
66 %
Approximate
Other
Heater voltage
6.3 V
Heater current
600 mA
Maximum DC anode voltage
26000 V
Maximum DC grid #2 voltage
500 V
Maximum grid #1 negative-bias magnitude
125 V
Maximum grid #1 positive DC voltage
0 V
Maximum grid #1 positive peak voltage
2 V
Typical DC anode voltage
14000 V
TelevisionPictureTube
Typical DC grid #2 voltage
300 V
TelevisionPictureTube
Typical grid #1 voltage minimum
-77 V
VisualExtinctionRange
Typical grid #1 voltage maximum
-33 V
VisualExtinctionRange
Maximum grid #1 circuit resistance
1.5 megohm
Ion trap magnet rated strength
45 gauss
Approximate
Focusing electrode voltage minimum
-55 V
ElectrostaticFocus
Focusing electrode voltage maximum
300 V
ElectrostaticFocus
Capacitance
Cathode-to-all-other-electrodes capacitance
5 pF
Approximate
Grid #1-to-all-other-electrodes capacitance
6 pF
Approximate
Application
Application
Direct-view television picture tube
Data set 03
1968 General Electric Co
Published operating points and test conditions from this source.
SECTION 1
Cathode Ray
Other
Maximum Anode Voltage
16000 V
Maximum Grid No. 2 Voltage
500 V
Anode Voltage
14000 V
Typical
Heater Voltage
6.3 V
Heater Current
600 mA
Data set 04
1971 RCA HB3 Binder 1 of 7
Published operating points and test conditions from this source.
SECTION 1
Cathode Ray
Other
Maximum grid 2 voltage
500 V
Maximum grid 1 negative-bias voltage
125 V
NegativeBias
Maximum grid 1 positive-bias voltage
0 V
PositiveBias
Maximum grid 1 positive-peak voltage
2 V
PositivePeak
Peak heater-cathode voltage
180 V
HeaterPositive
Characteristic
Diagonal deflection angle
70 deg
Approximate
Horizontal deflection angle
66 deg
Approximate
Vertical deflection angle
50 deg
Approximate