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
P7
Specialized - Cathode Ray ·CathodeRay
3JP7
Small electrostatically focused and deflected P7 cathode-ray instrument tube for oscillograph and waveform display, with a 6.3 V heater and phosphor persistence appropriate to the P7 screen.
Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
- Sections
- 1
- Base
- -
- Socket code
- OCTALCRT8
- Base pins
- -
- Nominal heater
- 6.3 V / 600 mA
Description
The Du Mont 3JP7 is a short high-light-output oscillographic CRT with intensifier electrode and high-current gun. This variant uses a P7 screen with blue/blue-white fluorescence and long persistence.
Socket description
Octal 8-contact CRT base
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- OCTALCRT8
- 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
- 4000 V
- Max screen voltage
- 500 V
3JP1 electrical family with P7 long-persistence phosphor.
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
1960 Du Mont
Published operating points and test conditions from this source.
SECTION 1
Cathode Ray
Characteristics
Heater Voltage
6.3 V
Heater Current
600 mA
Focusing Method
Electrostatic text
Deflection Method
Electrostatic text
Phosphor
P7 text
Fluorescence
Blue/blue-white text
Persistence
Long text
Post-Acceleration
Present text
Data set 03
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
P7 blue-white/yellow, 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
Data set 04
1971 RCA HB3 Binder 1 of 7
Published operating points and test conditions from this source.
SECTION 1
Cathode Ray
Other
Heater voltage
6.3 V
Heater current
600 mA
Peak heater-cathode voltage, heater negative
125 V
Anode No.3 post-deflection accelerator voltage
4000 V
Anode No.2 voltage
2000 V
Maximum deflecting electrode voltage
500 V
Maximum deflecting-electrode circuit resistance
5 megohm
Construction
Focusing method
Electrostatic
Deflection method
Electrostatic
Phosphor
P7
Characteristic
Fluorescence
Bluish fluorescence / greenish-yellow phosphorescence
Persistence
Long
Capacitance
Grid #1 to all other electrodes capacitance
8 pF
Approximate
Application
Application
Oscillograph/cathode-ray display