Data set 01
1950 Sylvania
Published operating points and test conditions from this source.
SECTION 1
Cathode Ray
Characteristic
Phosphor
P11
Focusing Method
Electrostatic
Deflecting Method
Electrostatic
Specialized - Cathode Ray ·CathodeRay
8CP11
Eight-inch special-purpose oscilloscope CRT with electrostatic focusing and deflection, post-deflection acceleration, and a P11 screen for bright short-persistence waveform display.
Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
- Sections
- 1
- Base
- -
- Socket code
- B12A
- Base pins
- -
- Nominal heater
- 6.3 V / 600 mA
Description
Eight-inch electrostatically focused/deflected special-purpose CRT with post-deflection acceleration and P11 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
- 10000 V
Published maximum ratings and characteristics promoted semantically from the approved source.
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
Post-deflection acceleration
Present
Fluorescence
Blue
Persistence
Short
Heater voltage
6.3 V
Heater current
600 mA
Deflection factor plates 1-2
58 to 81 V/in
Deflection factor plates 3-4
49 to 68 V/in
Construction
Phosphor
P11
Useful screen diameter minimum
7.5 in
Other
Typical anode-3 voltage
4000 V
Typical anode-2 voltage
2000 V
Focus voltage range
540 to 800 V
Grid1 cutoff voltage range
-24 to -56 V
Grid1 negative-bias maximum
-220 V
Grid1 positive-bias maximum
0 V
Grid1 positive peak maximum
2 V
Heater-cathode voltage maximum heater negative
140 V
Heater-cathode voltage maximum heater positive
140 V
Anode2-to-deflection-plate peak voltage maximum
550 V
Grid1 circuit resistance maximum
1.5 Mohm
Deflection-circuit resistance maximum
5 Mohm
Application
Application
Oscilloscope / special-purpose instrument display