Specialized - Cathode Ray ·CathodeRay
Six-inch oscilloscope CRT with electrostatic focusing and deflection, post-deflection acceleration, and a P2 phosphor screen. Sylvania documentation gives high-voltage operation to approximately 15 kV.
Six-inch electrostatically focused/deflected oscilloscope CRT with post-deflection acceleration and P2 phosphor.
Keyed 25-contact CRT base family (JEDEC B25-139)
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
Representative electron-gun section; three independent substantially identical guns are compressed to one section row.
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 Current
1.5 A to 1.98 A
All sections
Useful Scan
4 in
D1-D2 and D3-D4
Screen Fluorescence
Blue-green to green
Persistence
Long
Maximum Anode No. 2 Voltage
4500 V
Typical Anode No. 3 Voltage
12000 V
Data set 02
Published operating points and test conditions from this source.
Focusing method
Electrostatic
Deflection method
Electrostatic
Post-deflection acceleration
Present
Fluorescence
Blue-green / green afterglow
Persistence
Long
Heater voltage
6.3 V
Heater current range
1.50 to 1.98 A
Deflection-factor uniformity maximum
5 %
Phosphor
P2
Useful screen diameter minimum
5-3/16 in
Typical anode-3 voltage
12000 V
Typical anode-2 voltage
4000 V
Focus voltage range
950 to 1225 V
Grid1 circuit resistance maximum
1.5 Mohm
Deflection-circuit resistance maximum
1 Mohm
Application
Oscilloscope / laboratory instrument display