Specialized - Cathode Ray ·CathodeRay
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.
Electrostatically focused and deflected oscilloscope/instrument CRT with P1 phosphor.
Octal 8-contact CRT base
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
3-inch oscillograph CRT.
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.
Focusing method
Electrostatic
Deflection method
Electrostatic
Heater voltage
6.3 V
Heater current
600 mA
Fluorescence
Green
Heater current approximate
2.1 A
Application
Oscilloscope / precision instrument display
Typical anode-2 voltage
1500 V
Focus voltage range
240 to 560 V
Grid cutoff voltage range
-25 to -75 V
Data set 02
Published operating points and test conditions from this source.
Heater voltage
6.3 V
Heater current
600 mA
Peak heater-cathode voltage, heater negative
125 V
Typical final accelerating anode voltage
1500 V
Maximum deflecting electrode voltage
550 V
Focusing method
Electrostatic
Deflection method
Electrostatic
Phosphor
P1
Fluorescence
Green
Persistence
Medium
Grid #1 to all other electrodes capacitance
8 pF
Approximate
Application
Oscillograph/cathode-ray display