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Specialized - Switching Tube ·Thyratron

Z900T

Cold-cathode trigger tube for switching and control circuits. Gas-discharge operation provides abrupt heaterless switching.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
Sections
1
Base
MINIATURE
Socket code
B7G
Base pins
7
Nominal heater
-

Description

Cold-cathode trigger tube for switching and control circuits.

Socket description

Miniature 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
MINIATURE
Socket code
B7G
Base pins
7
Nominal heater voltage
-
Nominal heater current
-
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

MINIATURE - 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 plate voltage
180 V
Max cathode current
25 mA

Gas-discharge device.

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

1957 Philips Receiving and Amplifying Tubes

Published operating points and test conditions from this source.

SECTION 1

Thyratron

Characteristic

  • AnodeIgnitionVoltage

    290 V

    StarterVoltage=0V

  • StarterIgnitionVoltageMinimum

    73 V

  • StarterIgnitionVoltageMaximum

    105 V

  • MaintainingVoltage

    62 V

    AnodeCurrent=25mA

Data set 02

1963 Philips Electron Tubes Handbook V2

Published operating points and test conditions from this source.

SECTION 1

Thyratron

Characteristic

  • Anode ignition voltage at starter 0 V

    290 V

  • Starter ignition voltage variable

    73 to 105 V

  • Starter ignition voltage at anode 0 V

    80 V

  • Anode burning voltage at 50 mA

    85 V

  • Anode maintaining voltage at 25 mA

    62 V

  • Starter maintaining voltage at 10 mA

    75 V

  • Starter maintaining voltage at anode current 25 mA

    61 V

  • Anode-starter breakdown voltage

    200 to - V

    Minimum

  • Starter transfer current

    50 to 400 uA

  • Anode transfer current

    - to 160 uA

    Maximum

  • Ionization time

    20 us

  • Deionization time

    500 us

Other

  • Maximum anode-starter voltage

    - to 180 V

  • Maximum average cathode current

    - to 25 mA

  • Maximum peak cathode current

    - to 100 mA

  • Maximum positive starter peak current

    - to 100 mA

  • Relay-service AC supply voltage

    117 V RMS

    50Hz

  • Maximum peak inverse voltage as rectifier

    - to 200 V

    50Hz

  • Maximum rectifier current

    - to 100 mA

    50Hz

Data set 03

1971 Mullard Gas Filled Tubes

Published operating points and test conditions from this source.

SECTION 1

Thyratron

Characteristic

  • Anode maintaining voltage

    62 V

  • Trigger ignition voltage

    80 V

Data set 04

1999 Philips 0-D

Published operating points and test conditions from this source.

SECTION 1

Thyratron

Construction

  • Filling

    Gas; cold cathode

Characteristics

  • Typical anode ignition voltage

    290 V

    ControlVoltage=0V

  • Typical starter ignition voltage

    80 V

Other

  • Maximum anode supply voltage

    180 V

  • Maximum cathode current

    25 mA

  • Maximum peak cathode current

    100 mA