Skip to main content

Specialized - Switching Tube ·RelayControlSwitch

G1502D

Cold-cathode three-electrode gas-filled triode with activated cathode for relay and counter applications. Gas-discharge conduction provides heaterless control switching.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
Sections
1
Base
-
Socket code
IO
Base pins
-
Nominal heater
-

Description

Cold-cathode three-electrode gas-filled triode with activated cathode for relay and counter applications.

Socket description

International Octal

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
IO
Base pins
-
Nominal heater voltage
-
Nominal heater current
-
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

RelayControlSwitch

X-ray radiationInterelectrode capacitances
Max cathode current
30 mA

Published ratings/characteristics promoted where applicable.

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

1946 Standard Telephone and Cables

Published operating points and test conditions from this source.

SECTION 1

RelayControlSwitch

Characteristic

  • Control gap breakdown voltage minimum

    60 V

    Published datasheet value

Other

  • Control gap breakdown voltage maximum

    80 V

    Published datasheet value

  • Maximum peak cathode current

    50 mA

    Published datasheet value

  • Maximum average cathode current

    30 mA

    Published datasheet value

Data set 02

1947 Standard Valves

Published operating points and test conditions from this source.

SECTION 1

RelayControlSwitch

Characteristics

  • Control-gap breakdown voltage

    70 V

  • Control-gap maintaining voltage

    60 V

  • Main-gap minimum breakdown voltage

    150 V

  • Main-gap maintaining voltage

    75 V

  • Transfer current at 130 V anode

    5 uA

Other

  • Optimum operating current

    20 mA

  • Maximum peak cathode current

    50 mA

Data set 03

1958 Brimar Radio Valve No 7

Published operating points and test conditions from this source.

SECTION 1

RelayControlSwitch

Characteristic

  • Main Gap Breakdown Voltage Minimum

    150 V

  • Main Gap Maintaining Voltage Minimum

    60 V

  • Main Gap Maintaining Voltage Maximum

    77 V

  • Control Gap Breakdown Voltage Minimum

    60 V

  • Control Gap Breakdown Voltage Maximum

    80 V

Other

  • Recommended Operating Current

    20 mA

  • Maximum Peak Cathode Current

    50 mA

  • Maximum Average/Direct Cathode Current

    30 mA