Data set 01
1950 Sylvania
Published operating points and test conditions from this source.
SECTION 1
Cathode Ray
Characteristics
Phosphor
P4
Deflection method
Magnetic
Focusing method
Tri-potential electrostatic
Specialized - Cathode Ray ·CathodeRay
21FAP4
Twenty-one-inch direct-view monochrome television picture tube with magnetic deflection and high-voltage operation. Manufacturer documentation describes its focusing system, picture-screen construction, and receiver-display characteristics for large-screen television service.
Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
- Sections
- 1
- Base
- -
- Socket code
- NEOEIGHTAR7
- Base pins
- -
- Nominal heater
- 6.3 V / 600 mA
Description
The 21FAP4 is a 21-inch television cathode-ray tube with magnetic deflection and P4 phosphor.
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
- -
- Socket code
- NEOEIGHTAR7
- Base pins
- -
- Nominal heater voltage
- 6.3 V
- Nominal heater current
- 600 mA
- Parallel heater voltage
- -
- Parallel heater current
- -
- Series capable
- No
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
Direct-view CRT; maximum anode voltage promoted. Source warns of possible X-radiation exposure above specified voltage conditions.
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
Heater Voltage
6.3 V
Heater Current
600 mA
Focusing Method
Electrostatic text
Deflection Method
Magnetic text
Phosphor
P4 text
Fluorescence
White text
Persistence
Medium Short text
Other
Maximum Anode Voltage
25000 V
RepresentativeFamilyLimit
Typical Anode Voltage
18000 V
RepresentativeFamilyOperatingPoint
Maximum Grid2 Voltage
700 V
RepresentativeFamilyLimit
Maximum Grid1 Negative Bias
220 V
RepresentativeFamilyLimit
Maximum Heater-Cathode Voltage
200 V
AfterWarmup
Maximum Grid1 Circuit Resistance
1.5 Mohm