Data set 01
1950 Sylvania
Published operating points and test conditions from this source.
SECTION 1
Cathode Ray
Characteristic
Phosphor
P4
Focusing Method
Magnetic
Deflecting Method
Magnetic
Specialized - Cathode Ray ·CathodeRay
8FP4
Eight-inch P4 cathode-ray display tube for high-voltage direct visual service, using magnetic deflection and manufacturer-specified focusing, grid-control, and accelerating-voltage characteristics.
Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
- Sections
- 1
- Base
- -
- Socket code
- DUODECAL5
- Base pins
- -
- Nominal heater
- 6.3 V / 600 mA
Description
The Sylvania 8FP4 is a 8-inch P4 television picture tube with magnetic focus/deflection and ion trap.
Socket description
Small-shell Duodecal 5-contact CRT base
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- DUODECAL5
- 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
No fixed ratings are recorded for this section.
Published maximum ratings and characteristics promoted semantically from the approved source.
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
Magnetic text
Deflection Method
Magnetic text
Deflection Angle
70 deg
Approximate
Phosphor
P4 text
Fluorescence
White text
Persistence
Short to Medium text
Cathode-to-All Capacitance
5 pF
Approximate
Grid1-to-All Capacitance
6 pF
Approximate
Other
Maximum Anode Voltage
19800 V
Maximum Grid2 Voltage
550 V
Maximum Grid1 Negative Bias
155 V
RepresentativePublishedLimit
Maximum Grid1 Positive Peak
2 V
Maximum Heater-Cathode Voltage During Warmup
450 V
Duration<=15s
Maximum Heater-Cathode Voltage After Warmup
200 V
Anode Voltage
16000 V
Grid2 Voltage
300 V
Grid1 Cutoff Voltage Minimum
-72 V
Grid1 Cutoff Voltage Maximum
-35 V
Maximum Grid1 Circuit Resistance
1.5 Mohm
Focusing Coil Current
125 mA
Approximate; ±15%
Ion Trap Magnet Current
30 mA
Average
Minimum Ion Trap Field Strength
33 gauss