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3BYP31

Three-inch flat-face oscilloscope CRT with electrostatic focusing, double electrostatic deflection, and post-deflection acceleration. Designed for dual-trace oscilloscope service, it combines precise beam control with increased post-accelerated screen brightness.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

Sections: 1
Base: -
Socket code: -
Base pins: 14
Nominal heater: 6.3 V / 95 mA

Description

Flat-face cathode-ray tube with electrostatic focusing, double electrostatic deflection and post-deflection acceleration for dual-trace oscilloscope service.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: -
Base pins: 14
Nominal heater voltage: 6.3 V
Nominal heater current: 95 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 cathode current: 0.2 mA
Rectifier max heater-cathode voltage: 100 V

CRT ratings retained primarily as parameters; direct interelectrode capacitances are 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 01

1953 Amperex

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Other

Post accelerator voltage maximum
2500 V
Post accelerator voltage minimum
1200 V
Isolation shield voltage
2200 V
Accelerator voltage
300 V
Peak voltage grid 4 to deflection plate
500 V