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

5BHP5

Five-inch oscilloscope CRT with electrostatic focusing and deflection and a P5 phosphor screen. The family uses a flat face and high-sensitivity electron optics for direct waveform and instrument display.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
Sections
1
Base
14AG
Socket code
DIHEPTAL12
Base pins
12
Nominal heater
6.3 V / 600 mA

Description

Five-inch direct-view oscilloscope CRT with flat faceplate, electrostatic focus/deflection, helical-resistor post-deflection acceleration, and high deflection sensitivity.

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
14AG
Socket code
DIHEPTAL12
Base pins
12
Nominal heater voltage
6.3 V
Nominal heater current
600 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

14AG - 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

CRT highest published anode/accelerating voltage is promoted to MaxPlateVoltage; additional electrode, deflection, optical, and capacitance data are retained 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

1965 Sylvania Electronic Tubes Vol3

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Capacitance

  • Cathode to all other electrodes capacitance

    4.6 pF

  • Grid No. 1 to all other electrodes capacitance

    6.4 pF

  • Deflection plates D1-D2 capacitance

    1.9 pF

  • Deflection plates D3-D4 capacitance

    1.5 pF

  • D1 to all other electrodes except D2 capacitance

    3.5 pF

  • D2 to all other electrodes except D1 capacitance

    3.5 pF

  • D3 to all other electrodes except D4 capacitance

    2.8 pF

  • D4 to all other electrodes except D3 capacitance

    2.8 pF

Characteristics

  • Post-accelerator helix resistance

    200 to 600 MOhm

  • Maximum pattern distortion at 100% useful scan

    1.5 %

  • Maximum undeflected spot-position deviation

    5 mm

  • Useful scan D1-D2

    10 cm

  • Useful scan D3-D4

    4 cm

Other

  • Maximum anode No. 2 input

    6 W

  • Maximum anode No. 3 voltage

    13200 V

  • Maximum isolation shield voltage

    2300 V

  • Maximum deflection-plate shield voltage

    2300 V

  • Maximum anode No. 2 voltage

    2200 V

  • Maximum anode No. 1 focus voltage

    880 V

  • Maximum negative grid No. 1 bias magnitude

    200 V

  • Peak heater-cathode voltage during warm-up

    200 V

  • Peak heater-cathode voltage after warm-up

    180 V

  • Peak voltage between anode No. 2 and any deflection plate

    550 V

  • Typical anode No. 3 voltage

    10000 V

  • Typical isolation shield voltage range

    1575 to 1700 V

  • Typical deflection-plate shield voltage range

    1575 to 1700 V

  • Typical anode No. 2 voltage

    1670 V

  • Focus voltage range

    180 to 590 V

  • Grid No. 1 cutoff voltage range

    -80 to -50 V

  • Deflection factor D1-D2

    70 to 85 V/in

  • Deflection factor D3-D4

    15 to 18.3 V/in

CircuitValue

  • Grid No. 1 circuit resistance maximum

    1.5 MOhm