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3FP7A

Electrostatically focused and deflected P7 cathode-ray instrument tube with a combination short- and long-persistence screen, post-acceleration, and an anode rating up to 8 kV.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

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

Description

Three-inch electrostatic-focus and electrostatic-deflection cathode-ray tube with a combination short- and long-persistence P7 screen for oscilloscope applications.

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

Max plate voltage: 8000 V

Published ratings and characteristics promoted where clearly stated; remaining published values retained as section 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 01

1940 RCA

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Characteristics

Heater or filament voltage
6.3 V
Published nominal value
Heater or filament current
600 mA
Published nominal value
Deflection method
Electrostatic
Published
Focusing method
Electrostatic
Published
Phosphor
P7
Combination long- and short-persistence screen

Other

Anode No.3 maximum voltage
8000 V
Absolute maximum
Anode No.2 and grid No.2 maximum voltage
2200 V
Absolute maximum