Data set 01
1950 Sylvania
Published operating points and test conditions from this source.
SECTION 1
Cathode Ray
Characteristic
HeaterOrFilamentVoltage
6.3 V
HeaterOrFilamentCurrent
600 mA
MinimumUsefulScreenDiameter
9 in
Specialized - Cathode Ray ·CathodeRay
SC3890
High-resolution special-purpose CRT with magnetic focusing and deflection, P11 blue short-persistence phosphor, and a flat optical-glass face for detailed precision display or recording.
Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
- Sections
- 1
- Base
- -
- Socket code
- DUODECAL6
- Base pins
- -
- Nominal heater
- 6.3 V / 600 mA
Description
Sylvania SC3890 special-purpose CRT with magnetic focus and magnetic deflection; P11 blue, flat optical-glass face. Published high-voltage ratings, focus/deflection data, capacitances, circuit limits, and typical operating conditions were extracted from the supplied datasheet.
Socket description
Small-shell Duodecal 6-contact CRT base
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- DUODECAL6
- 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
- 25000 V
Ratings and characteristics promoted from the supplied Sylvania source where explicitly published.
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
Characteristic
Heater Voltage
6.3 V
Heater Current
600 mA
FocusingMethod
Magnetic
DeflectionMethod
Magnetic
PhosphorOrScreen
P11 blue, flat optical-glass face
UsefulScreenOrScan
9 inch
Grid1 To All Capacitance
7.5 pF
Cathode To All Capacitance
5 pF
Other
AnodeVoltageMaximum
25000 V
Grid1NegativeBiasMagnitudeMaximum
150 V
Grid1PositiveBiasMaximum
0 V
Grid1PositivePeakVoltageMaximum
0 V
Grid1CircuitResistanceMaximum
1.5 Mohm
HeaterCathodeVoltageMaximum
200 V
AfterWarmup
Grid2VoltageTypical
2000 V
Grid2VoltageMaximum
2500 V
Anode Voltage
20000 V
Grid1VoltageForCutoff
-33 to -77 V
LineWidth
0.002 in