Data set 01
1950 Sylvania
Published operating points and test conditions from this source.
SECTION 1
Cathode Ray
Characteristic
Phosphor
P4
Focusing Method
Electrostatic
Deflecting Method
Electrostatic
Other
Typical Anode No. 2 Voltage
2000 V
Specialized - Cathode Ray ·CathodeRay
3SP4
Three-inch cathode-ray tube for oscilloscope and instrument display service, using electrostatic focusing and electrostatic deflection. Its P4 screen designation identifies the phosphor variant within this compact oscillographic family.
Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
- Sections
- 1
- Base
- -
- Socket code
- B12A
- Base pins
- -
- Nominal heater
- 6.3 V / 600 mA
Description
Three-inch rectangular direct-view oscilloscope CRT with electrostatic focus and electrostatic deflection.
Socket description
Duodecal 12-contact
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- B12A
- 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 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
Focusing method
1 code
Electrostatic
Deflection method
1 code
Electrostatic
Deflection factor D1-D2 minimum
146 V/in
Deflection factor D1-D2 maximum
198 V/in
Deflection factor D3-D4 minimum
104 V/in
Deflection factor D3-D4 maximum
140 V/in
Useful screen / scan
1 code
1.5 x 3-inch rectangular direct-view screen
Phosphor designation
1 code
P4
Other
Anode No. 2 / accelerator voltage maximum
3000 V
Anode No. 2 / accelerator voltage
2000 V
Focusing electrode voltage maximum
1200 V
Focusing electrode voltage minimum
330 V
Focusing electrode voltage maximum
620 V
Grid No. 1 cutoff voltage minimum
-135 V
Grid No. 1 cutoff voltage maximum
-58 V
Peak heater-to-cathode voltage
140 V
Peak voltage between accelerator and any deflection plate
550 V
Grid No. 1 negative bias maximum
200 V