Data set 01
1950 Sylvania
Published operating points and test conditions from this source.
SECTION 1
Cathode Ray
Characteristic
Heater Voltage
6.3 V
Heater Current
450 mA
Other
Maximum Anode Voltage
22000 V
Grid2 Voltage
550 V
Specialized - Cathode Ray ·CathodeRay
23CTP4
Twenty-three-inch direct-view monochrome television picture tube with electrostatic focusing, magnetic deflection, and an aluminized P4 screen. Manufacturer documentation places it in the high-voltage receiver CRT family used for bright rectangular picture presentation.
Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
- Sections
- 1
- Base
- 12L
- Socket code
- NEOEIGHTAR7
- Base pins
- -
- Nominal heater
- 6.3 V / 450 mA
Description
23-inch direct-view monochrome television CRT with electrostatic focus, magnetic deflection, aluminized P4 screen, and gray/filter faceplate construction.
Socket description
Small-button Neoeightar 7-contact CRT base family
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- 12L
- Socket code
- NEOEIGHTAR7
- Base pins
- -
- Nominal heater voltage
- 6.3 V
- Nominal heater current
- 450 mA
- Parallel heater voltage
- -
- Parallel heater current
- -
- Series capable
- No
12L - 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
- 22000 V
- Max screen voltage
- 550 V
High-voltage CRT ratings promoted from source. Sylvania source includes X-ray radiation precautions/warning.
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
1965 Sylvania Electronic Tubes Vol3
Published operating points and test conditions from this source.
SECTION 1
Cathode Ray
Characteristics
Focusing method
Electrostatic
Deflection method
Magnetic
Horizontal deflection angle
99 deg
Diagonal deflection angle
110 deg
Vertical deflection angle
82 deg
Fluorescence
White
Persistence
Short to medium
Heater voltage
6.3 V
Heater current
450 mA
Construction
Phosphor
Aluminized P4
Other
Maximum anode voltage
22000 V
Typical anode voltage
16000 V
Typical focus-electrode voltage maximum
400 V
Typical grid2 voltage
300 V
Cutoff voltage range
-35 to -72 V
Grid1 circuit resistance maximum
1.5 Mohm
Focus-electrode voltage minimum
-550 V
Focus-electrode voltage maximum
1100 V
Grid2 voltage maximum
550 V
X-radiation precaution
Operate within published maximum anode-voltage rating; source carries X-radiation warning at elevated EHT.
Capacitance
Grid1-to-all capacitance
6 pF
External conductive coating to anode capacitance maximum
2500 pF
Application
Application
Monochrome television picture display