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3RP4

Three-inch cathode-ray tube for oscilloscope and instrument display service, using electrostatic focusing and electrostatic deflection. Its P4 screen designation identifies the phosphor variant within this compact oscillographic family.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 6.3 V / 600 mA

Description

Three-inch direct-view oscilloscope CRT variant with P4 white short-to-medium-persistence screen.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: -
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

No fixed ratings are recorded for this section.

Published 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 01

1950 Sylvania

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Characteristic

Phosphor
P4
Focusing Method
Electrostatic
Deflecting Method
Electrostatic

Data set 02

1965 Sylvania Electronic Tubes Vol3

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Characteristics

Focusing method
1 code
Electrostatic
Deflection method
1 code
Electrostatic
Deflection factor D1-D2 minimum
146 V/in
Deflection factor D1-D2 maximum
198 V/in
Deflection factor D3-D4 minimum
104 V/in
Deflection factor D3-D4 maximum
140 V/in
Useful screen / scan
1 code
3-inch round direct-view screen
Phosphor designation
1 code
P4

Other

Anode No. 2 / accelerator voltage maximum
2750 V
Anode No. 2 / accelerator voltage
2000 V
Focusing electrode voltage maximum
1100 V
Focusing electrode voltage minimum
330 V
Focusing electrode voltage maximum
620 V
Grid No. 1 cutoff voltage minimum
-135 V
Grid No. 1 cutoff voltage maximum
-45 V
Peak heater-to-cathode voltage
140 V
Peak voltage between accelerator and any deflection plate
550 V
Grid No. 1 negative bias maximum
220 V