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Tube Tinker — Electron Tube Database
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Diode (NOT rectifier) ·Diode

7178

Hydrogen-filled high-current diode designed as a pulse-transformer backswing clipper in high-power pulse circuits.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
-
Base pins
-
Nominal heater
5 V / 14 A

Description

Hydrogen-filled high-current diode for pulse-transformer backswing clipper applications.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
-
Base pins
-
Nominal heater voltage
5 V
Nominal heater current
14 A
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

Diode

X-ray radiationInterelectrode capacitances
Max plate voltage
30000 V
Max cathode current
500 mA
Rectifier peak inverse voltage
30000 V
Rectifier nominal output current
500 mA
Rectifier peak forward current
500 A

Pulse clipping diode; inverse-voltage and current limits retained.

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

1962 ITT

Published operating points and test conditions from this source.

SECTION 1

Diode

Characteristic

  • Heater voltage

    4.7 to 5.3 V

  • Heater current

    14 A to 24 A

  • Reservoir current

    2 A to 5 A

  • Reservoir voltage

    4.7 to 5.3 V

Other

  • Minimum heating time

    10 min

  • Maximum transient inverse anode voltage

    30000 V

  • Maximum operating inverse anode voltage

    16000 V

  • Minimum anode voltage

    500 V

  • Maximum peak anode current

    500 A

  • Maximum average anode current

    500 mA

  • Maximum RMS anode current

    15 A

Data set 02

1964 RMA EIA

Published operating points and test conditions from this source.

SECTION 1

Diode

Characteristic

  • Heater Voltage

    5 V

  • Heater Current

    14 A

  • ReservoirVoltage

    5 V

  • ReservoirCurrentMinimum

    2 A

  • ReservoirCurrentMaximum

    5 A

  • MinimumHeatingTime

    10 min

  • Minimum Anode Voltage

    500 V

  • DeviceGas

    Hydrogen

Other

  • PeakInverseVoltageTransientMaximum

    30 kV

  • PeakInverseVoltageOperatingMaximum

    16 kV

  • PeakAnodeCurrentMaximum

    500 A

  • RMSAnodeCurrentMaximum

    15 A