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7BJP1

Seven-inch diagonal square-face five-beam CRT with electrostatic focusing and deflection. Each independently controlled beam scans a separate screen area, enabling simultaneous multi-channel instrument or waveform presentation.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

Sections: 5
Base: -
Socket code: B12A
Base pins: -
Nominal heater: 6.3 V / 300 mA

Description

The ETC 7BJP1 is a seven-inch diagonal square-face five-beam electrostatic-focus and deflection cathode-ray tube. Each beam is independently controllable and scans a separate screen area.

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: 300 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

5 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 nominal
300 mA
Maximum post-accelerator voltage
7700 V
Maximum accelerator voltage
3850 V
Maximum focusing voltage
1650 V
Maximum accelerator-to-deflection-electrode voltage
1250 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
450 to 650 V
Typical grid-1 voltage
-90 to -50 V
Post-accelerator to accelerator ratio maximum
2
Modulation factor
55 V
Line width
0.65 mm
Deflection factor D1-D2 minimum
68 V/in
Deflection factor D1-D2 maximum
84 V/in
Deflection factor D3-D4 minimum
27 V/in
Deflection factor D3-D4 maximum
37 V/in
Interaction factor maximum
0.00001 in/V

Construction

Focusing method
Electrostatic
Deflecting method
Electrostatic
Electron gun / beam count
5

Characteristic

Phosphor options
P1,P2,P7,P11

Capacitance

Cathode to all other electrodes
4.9 to 6.5 pF
Grid 1 to all other electrodes
4.8 to 7 pF
D1 to D2
2.7 pF
D3 to D4
3.2 pF