Data set 01
1950 Sylvania
Published operating points and test conditions from this source.
SECTION 1
Cathode Ray
Characteristics
Focusing method
Electrostatic
Deflection method
Electrostatic
Phosphor
P1
Specialized - Cathode Ray ·CathodeRay
3ASP1
Three-inch oscilloscope and instrument cathode-ray tube with electrostatic focusing and electrostatic deflection and a P1 screen. Manufacturer documentation supports compact waveform, measurement, and indicator-display service.
Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
- Sections
- 1
- Base
- -
- Socket code
- B12A
- Base pins
- -
- Nominal heater
- 6.3 V / 600 mA
Description
Electrostatically focused and deflected oscilloscope/instrument CRT with P1 phosphor.
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
- Max plate voltage
- 3000 V
Published source values promoted where applicable; additional values retained as parameters.
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
Electrostatic
Heater voltage
6.3 V
Heater current
600 mA
Fluorescence
Green
P1 light output minimum
20 foot-lambert
Modulation maximum
38 V
Line width maximum
0.65 mm
Application
Application
Oscilloscope / precision instrument display
Other
Typical anode-2 voltage
2000 V
Focus voltage range
400 to 700 V
Grid cutoff voltage range
-40 to -70 V
Grid1 circuit resistance maximum
1.5 Mohm
Deflection-circuit resistance maximum
1 Mohm