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

504TM

Five-inch camera-viewfinder cathode-ray tube with magnetic focusing and magnetic deflection and a metal-backed screen. Ferranti documentation gives anode capability to approximately 11 kV for camera monitoring.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
Sections
1
Base
B8G
Socket code
IO
Base pins
8
Nominal heater
6.3 V / 300 mA

Description

Five-inch camera-viewfinder cathode-ray tube with magnetic focus and deflection and a metal-backed screen.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
B8G
Socket code
IO
Base pins
8
Nominal heater voltage
6.3 V
Nominal heater current
300 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

B8G - 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
11000 V

Ratings, characteristics, typical operating points, and capacitances were extracted from the supplied Ferranti 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

1963 Ferranti

Published operating points and test conditions from this source.

SECTION 1

Cathode Ray

Characteristic

  • HeaterOrFilamentVoltage

    6.3 V

  • HeaterOrFilamentCurrent

    300 mA

  • FocusingMethod

    Magnetic

  • DeflectionMethod

    Magnetic

  • ScreenConstruction

    Metal-backed

  • UsefulScreenDiameterMinimum

    108 mm

Other

  • FirstAnodeVoltageMinimum

    200 V

  • FirstAnodeVoltageMaximum

    500 V

  • SecondAnodeVoltageMinimum

    5500 V

  • SecondAnodeVoltageMaximum

    11000 V

  • HeaterCathodeVoltageMaximum

    150 V

    HeaterPositive

  • HeaterCathodeVoltageMaximum

    200 V

    HeaterNegative

  • FirstAnodeSupplyImpedanceMaximum

    15 Mohm

  • FirstAnodeVoltage

    300 V

  • SecondAnodeVoltage

    7000 V

  • GridDriveFor50uABeamCurrent

    20 V

  • FocusCoil

    570 ampere-turn