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
P2
Specialized - Cathode Ray ·CathodeRay
3ADP2
Small electrostatically focused and deflected P2 cathode-ray tube for oscilloscope and precision-instrument display, with post-deflection acceleration and a 6.3 V heater.
Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
- Sections
- 1
- Base
- -
- Socket code
- B12A
- Base pins
- -
- Nominal heater
- 6.3 V / 600 mA
Description
The Du Mont 3ADP2 is a compact three-inch flat-face CRT with post-acceleration, very high deflection sensitivity, and small spot size. This variant uses a P2 screen with blue-green/green fluorescence and long persistence.
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
- 6600 V
Cathode-ray display/electron-gun section.
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
1960 Du Mont
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
Electrostatic text
Phosphor
P2 text
Fluorescence
Blue-green/green text
Persistence
Long text
Post-Acceleration
Present text
Other
Maximum Post-Accelerator Voltage
6000 V
Maximum Accelerator Voltage
3000 V
Maximum Focusing Electrode Voltage
1000 V
Data set 03
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
Blue-green
Deflection-factor uniformity maximum
2 %
Post-deflection acceleration
Present
Application
Application
Oscilloscope / precision instrument display
Other
Typical anode-2 voltage
2000 V
Focus voltage range
320 to 470 V
Grid cutoff voltage range
-52 to -87 V