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Tube Tinker — Electron Tube Database
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Specialized - Cathode Ray ·CathodeRay

5DAP1

Five-and-one-quarter-inch flat-face oscilloscope CRT with electrostatic focusing and deflection, linear post-acceleration, high writing rate, and pattern/astigmatism adjustment for bright precision waveform display.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
Sections
1
Base
-
Socket code
B14A
Base pins
-
Nominal heater
6.3 V / 600 mA

Description

5.25-inch flat-face electrostatic-focus and electrostatic-deflection cathode-ray tube with linear post accelerator, high writing rate, and pattern/astigmatism adjustment.

Socket description

Large readout/Nixie 14-contact base, 44.5 mm pin circle

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
B14A
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

1 physical section, each with unique specifications.

Section 1

Cathode Ray

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

CRT electron-gun/display section; CRT-specific ratings and operating data are stored as parameters.

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

1960 Du Mont

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Characteristics

  • Focusing method

    1 code

    Electrostatic

  • Deflection method

    1 code

    Electrostatic

  • Deflection factor D1-D2

    -

    Published range 48 to 63 V/in

  • Deflection factor D3-D4

    -

    Published range 13 to 16.5 V/in

  • Minimum useful screen

    4 in

  • Post-accelerator resistance minimum

    210 MOhm

  • Post-accelerator resistance maximum

    750 MOhm

Other

  • Accelerator voltage maximum

    2700 V

  • Accelerator voltage

    1400 V

  • Post-accelerator voltage maximum

    15000 V

  • Post-accelerator voltage

    12000 V

  • Grid No. 1 voltage

    -

    Published range -65 to -40 V

  • Grid No. 1 negative bias maximum

    200 V

  • Pattern adjustment electrode voltage

    1400 V

  • Deflection plate shield voltage

    1400 V

  • Astigmatism electrode voltage

    1400 V

Capacitance

  • Cathode to all other electrodes

    3.3 pF

    Approximate or first published bound

  • Grid No. 1 to all other electrodes

    5.1 pF

    Approximate or first published bound