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

5BGP2

Five-inch direct-view oscilloscope CRT with electrostatic focusing and deflection and a P2 blue-green/green long-persistence screen. Its high-voltage beam system supports bright, precise waveform presentation in instrumentation.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
Sections
1
Base
-
Socket code
DIHEPTAL12
Base pins
-
Nominal heater
6.3 V / 600 mA

Description

Sylvania 5-inch cathode-ray tube with electrostatic focus, electrostatic deflection, and P2 blue-green/green, long persistence. Published electrical ratings, capacitances, and operating conditions were extracted from the supplied datasheet.

Socket description

Medium-shell Diheptal 12-contact CRT base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
DIHEPTAL12
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
13200 V

Published CRT maximum ratings, capacitances, and typical operating conditions extracted from supplied Sylvania datasheet.

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

1965 Sylvania Electronic Tubes Vol3

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

  • Phosphor

    P2 blue-green/green, long persistence

  • MinimumUsefulScreen

    4.5 in

  • Cathode To All Capacitance

    4.8 pF

  • GridToAllCapacitance

    6.1 pF

  • PostAcceleratorHelixResistance

    200 to 600 Mohm

  • PatternDistortionMaximum

    1 %

  • UndeflectedSpotPositionMaximum

    5 mm

  • UsefulScanD1D2

    10 cm

  • UsefulScanD3D4

    6 cm

Other

  • FinalAnodeVoltageMaximum

    13200 V

  • Anode2VoltageMaximum

    2200 V

  • FocusElectrodeVoltageMaximum

    880 V

  • FinalAnodeVoltage

    10000 V

  • Anode2Voltage

    1670 V

  • FocusElectrodeVoltageForFocus

    180 to 590 V

  • GridVoltageForCutoff

    -50 to -80 V

  • GridCircuitResistanceMaximum

    1.5 Mohm

  • DeflectionFactorPlates1_2

    70 to 86 V/in

  • DeflectionFactorPlates3_4

    28.4 to 34.8 V/in

  • Anode2InputMaximum

    6 W

  • IsolationShieldVoltageMaximum

    2300 V

  • Anode3ToAnode2VoltageRatioMaximum

    6

  • PeakVoltageAnode2ToDeflectionPlate

    550 V