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Tube Tinker — Electron Tube Database
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Specialized - Traveling Wave ·TravelingWave

X401

Electronically tunable 8–12.7 GHz backward-wave amplifier with adjustable 16–65 MHz passband, solenoid focusing, and at least 20 dB small-signal gain.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
Sections
1
Base
-
Socket code
-
Base pins
-
Nominal heater
6.3 V / 1.9 A

Description

Backward-wave amplifier tube covering 8000–12700 MHz with electronically tunable 16–65 MHz passband, helical slow-wave structure, continuous-beam operation, and solenoid focusing.

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
6.3 V
Nominal heater current
1.9 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

TravelingWave

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Specialized microwave/image-intensifier device. Published beam, cathode, anode, helix, collector, RF, gain/noise, and optical ratings are preserved in TUBE_SECTION_PARAMETER rather than forced into unrelated promoted plate/screen fields.

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

TravelingWave

Characteristic

  • Frequency Range

    8000 to 12700 MHz

  • Pass Band Range

    16 to 65 MHz

Other

  • Small Signal Gain Minimum

    20 dB

  • Noise Figure Maximum

    15 dB

  • Heater Voltage Maximum

    6.5 V

  • Heater Current Maximum

    2 A

  • Cathode Voltage Range

    -1450 to -250 V

  • Cathode Current Maximum

    4 mA

  • Collector Voltage Maximum

    250 V

  • Helix Current Maximum

    0.3 mA

  • Collector Current Maximum

    4 mA

  • Typical Frequency Center

    10000 MHz

  • Typical Pass Band

    40 MHz

  • Typical Small Signal Gain

    25 dB

  • Typical Noise Figure

    13 dB

  • Typical Heater Voltage

    6.3 V

  • Typical Heater Current

    1.9 A

  • Typical Cathode Voltage

    -650 V

  • Typical Cathode Current

    2 mA