Specialized - Cathode Ray ·CathodeRay
Small electrostatically focused and deflected P1 cathode-ray tube for oscilloscope and precision-instrument display, with post-deflection acceleration and a 6.3 V heater.
The Du Mont 3ADP11 is a compact three-inch flat-face CRT with post-acceleration, very high deflection sensitivity, and small spot size. This variant uses a P11 screen with blue fluorescence and short persistence.
Duodecal 12-contact
General specifications
Properties common to every published source and operating point.
Electrical assignments shared by every tube using this base designation.
No verified pinout is recorded for this base designation.
1 physical section, each with unique specifications.
Section 1
Cathode-ray display/electron-gun section.
Source-dependent data
Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.
Data set 01
Published operating points and test conditions from this source.
Heater Voltage
6.3 V
Heater Current
600 mA
Focusing Method
Electrostatic text
Deflection Method
Electrostatic text
Phosphor
P11 text
Fluorescence
Blue text
Persistence
Short text
Post-Acceleration
Present text
Maximum Post-Accelerator Voltage
6000 V
Maximum Accelerator Voltage
3000 V
Maximum Focusing Electrode Voltage
1000 V
Data set 02
Published operating points and test conditions from this source.
Focusing method
Electrostatic
Deflection method
Electrostatic
Heater voltage
6.3 V
Heater current
600 mA
Fluorescence
Blue
Deflection-factor uniformity maximum
2 %
Post-deflection acceleration
Present
Application
Oscilloscope / precision instrument display
Typical anode-2 voltage
2000 V
Focus voltage range
320 to 470 V
Grid cutoff voltage range
-52 to -87 V