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Specialized - Switching Tube ·Thyratron

OA4G

Cold-cathode gas triode with starter anode for relay service. Heaterless gas discharge provides abrupt electronic control and switching.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
Sections
1
Base
-
Socket code
IO
Base pins
8
Nominal heater
-

Description

RCA OA4-G is a cold-cathode gas triode using a starter anode to initiate and transfer the glow discharge for relay-control 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
8
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

Thyratron

X-ray radiationInterelectrode capacitances
Max cathode current
100 mA

Published ratings and characteristics promoted from approved 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

1971 RCA HB3 Binder 2 of 7

Published operating points and test conditions from this source.

SECTION 1

Thyratron

Characteristic

  • Peak anode breakdown voltage with starter anode tied to cathode

    225 to - V

  • Peak positive starter-anode breakdown voltage

    70 to 90 V

  • Starter-anode current for transition to anode

    - to 100 uA

  • Starter-anode voltage drop

    60 V

  • Anode voltage drop

    70 V

Other

  • Peak cathode current

    100 mA

  • DC cathode current

    25 mA

  • AC anode-supply voltage

    105 to 130 V

    Relay service RMS

  • Maximum AC starter-anode voltage

    70 V

  • Minimum RF starter-anode voltage

    55 V

  • Minimum sum of AC and RF starter-anode voltages

    110 V