Skip to main content
Tube Tinker — Electron Tube Database
Alternatives & variationsDownload PDF datasheet

Specialized - Cathode Ray ·CathodeRay

7AXP1

Seven-inch P1 cathode-ray instrument tube for oscillographic or measurement display, with manufacturer-specified focusing, deflection, accelerating-voltage, and phosphor characteristics.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
Sections
4
Base
-
Socket code
B12A
Base pins
-
Nominal heater
6.3 V / 600 mA

Description

The ETC 7AXP1 is a seven-inch diagonal square-face four-beam electrostatic-focus and deflection cathode-ray tube with independently controllable beams and separately brought-out acceleration and deflection connections.

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
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

4 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

    600 mA

  • Maximum post-accelerator voltage

    10500 V

  • Maximum accelerator voltage

    3500 V

  • Maximum focusing voltage

    1750 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

    470 to 670 V

  • Typical grid-1 voltage

    -76 to -52 V

  • Post-accelerator to accelerator ratio maximum

    3

  • Modulation factor maximum

    55 V

  • Deflection factor D1-D2 minimum

    56 V/in

  • Deflection factor D1-D2 maximum

    58 V/in

  • Deflection factor D3-D4 minimum

    48 V/in

  • Deflection factor D3-D4 maximum

    59 V/in

Construction

  • Focusing method

    Electrostatic

  • Deflecting method

    Electrostatic

  • Electron gun / beam count

    4

Characteristic

  • Phosphor options

    P1,P2,P7,P11

Capacitance

  • Cathode to all other electrodes

    5.6 pF

  • Grid 1 to all other electrodes

    5.8 pF

  • D1 to D2

    2.5 pF

  • D3 to D4

    2.8 pF