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

5ELP1

Five-inch P1 cathode-ray instrument tube for oscillograph or measurement display, with manufacturer-specified focusing, deflection, accelerating voltages, and phosphor characteristics for precision waveform presentation.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
Sections
1
Base
-
Socket code
B14
Base pins
-
Nominal heater
6.3 V / 600 mA

Description

Five-inch flat-face oscilloscope CRT with electrostatic focus/deflection and helical post acceleration.

Socket description

Small-shell Diheptal 14-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
B14
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
Max plate voltage
12000 V

Published ratings/characteristics promoted from supplied source; additional conditions retained in parameter table.

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

1964 RMA EIA

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Characteristic

  • Heater Voltage

    6.3 V

  • Heater Current

    600 mA

  • FocusingMethod

    Electrostatic

  • DeflectionMethod

    Electrostatic

  • Cathode To All Capacitance

    4.6 pF

  • Grid1 To All Capacitance

    8.6 pF

  • D1ToD2Capacitance

    1.8 pF

  • D3ToD4Capacitance

    1.6 pF

  • PostAcceleratorResistanceMinimum

    200 Mohm

  • PostAcceleratorResistanceMaximum

    1500 Mohm

  • MinimumUsefulScreenDiameter

    4 in

Other

  • PostAcceleratorVoltageMaximum

    12000 V

  • IsolationShieldVoltageMaximum

    2100 V

  • DeflectionPlateAverageVoltageMaximum

    2100 V

  • FocusingElectrodeVoltageMaximum

    800 V

  • AverageDeflectionPlateVoltage

    1650 V