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4HP1

Short three-and-one-half-inch square-face three-beam oscilloscope CRT with independently controlled beams, shared acceleration/heater connections, and spiral post-acceleration. It supports simultaneous multi-trace measurement with reduced pattern and deflection distortion.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

Sections: 3
Base: -
Socket code: B12A
Base pins: -
Nominal heater: 6.3 V / -

Description

The ETC 4HP1 is a short 3.5-inch square-face, three-beam cathode-ray tube. Its three beams are independently controlled except for shared accelerating potentials and heater connections, and spiral post-acceleration reduces pattern and deflection distortion.

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: 6.3 V
Nominal heater current: -
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

3 physical sections, with 1 unique section. The remaining sections have identical specifications.

Section 1

Cathode Ray

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Representative row for identical electron-gun sections.

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

1961 Electronic Tube Corp

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Other

Heater voltage
6.3 V
Heater current
1.6 A to 2 A
Maximum post-accelerator voltage
5500 V
Maximum accelerator voltage
2750 V
Maximum focusing voltage
1500 V
Maximum accelerator-to-deflection-electrode voltage
750 V
Maximum negative grid-1 bias magnitude
200 V
Maximum positive grid-1 bias
0 V
Maximum heater-to-cathode voltage magnitude
180 V
Typical post-accelerator voltage
4000 V
Typical accelerator voltage
2000 V
Typical focusing voltage
350 to 450 V
Typical grid-1 voltage
-78 to -42 V

Construction

Focusing method
Electrostatic
Deflecting method
Electrostatic
Electron gun / beam count
3

Characteristic

Phosphor options
P1,P2,P7,P11

Capacitance

Cathode to all other electrodes
4.2 to 5.8 pF
Grid 1 to all other electrodes
4.8 to 6.2 pF