Data set 01
1950 Sylvania
Published operating points and test conditions from this source.
SECTION 1
Cathode Ray
Characteristics
Focusing method
Electrostatic
Deflection method
Electrostatic
Phosphor
P12
Specialized - Cathode Ray ·CathodeRay
3JP12
Small electrostatically focused and deflected P12 cathode-ray instrument tube for oscillograph and waveform display, with a 6.3 V heater and phosphor persistence appropriate to the P12 screen.
Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
- Sections
- 1
- Base
- -
- Socket code
- B14A
- Base pins
- -
- Nominal heater
- 6.3 V / 600 mA
Description
Sylvania 3JP12 direct-view oscilloscope CRT with electrostatic focus/deflection; P12 orange, long persistence. Published maximum ratings, capacitances, and typical operating conditions were extracted from the supplied datasheet.
Socket description
Large readout/Nixie 14-contact base, 44.5 mm pin circle
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- B14A
- 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
- 4400 V
Published source values promoted where applicable; additional values retained as parameters.
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
Electrostatic
DeflectionMethod
Electrostatic
Phosphor
P12 orange, long persistence
MinimumUsefulScreen
2.75 in
Other
Anode3VoltageMaximum
6000 V
Anode2VoltageMaximum
2200 V
Anode1FocusVoltageMaximum
1100 V
GridNegativeBiasMagnitudeMaximum
200 V
GridPositivePeakVoltageMaximum
2 V
PeakHeaterCathodeVoltageNegative
140 V
PeakVoltageAnode2ToDeflectionPlate
550 V
Anode3Voltage
4000 V
Anode2Voltage
2000 V
Anode1VoltageForFocus
400-700 V
GridVoltageForCutoff
-40 to -90 V
DeflectionFactorPlates1_2
180-220 V/in
DeflectionFactorPlates3_4
130-170 V/in
GridCircuitResistanceMaximum
1.5 Mohm
DeflectionCircuitResistanceMaximum
5 Mohm