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90EO4F

Three-and-one-half-inch oscilloscope cathode-ray tube with electrostatic focusing and electrostatic deflection. Its compact direct-view beam system is intended for waveform display and electronic measurement instrumentation.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

Sections: 1
Base: -
Socket code: B12A
Base pins: -
Nominal heater: 4 V / 1 A

Description

Electrostatically focused and deflected 3.5-inch oscilloscope cathode-ray tube.

Socket description

Duodecal 12-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: B12A
Base pins: -
Nominal heater voltage: 4 V
Nominal heater current: 1 A
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 from the approved datasheet.

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

196X Cintel

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Other

Modulator to all other electrodes capacitance
25 pF
Published datasheet value
Cathode to all other electrodes capacitance
15 pF
Published datasheet value
Each X Plate to all other electrodes capacitance
25 pF
Published datasheet value
One X to one Y Deflector Plate capacitance
6 pF
Published datasheet value