Skip to main content
Tube Tinker — Electron Tube Database
Alternatives & variationsDownload PDF datasheet

Specialized - Klystron ·Klystron

VA201B

Rugged Ferranti X-band reflex klystron designed as an airborne local oscillator, emphasizing exceptional frequency stability under severe environmental conditions.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
Sections
1
Base
-
Socket code
-
Base pins
-
Nominal heater
6.3 V / 1.2 A

Description

Ferranti VA201B is a rugged reflex klystron local oscillator for airborne X-band applications. It covers approximately 8.5-9.6 GHz and is designed for extreme frequency stability under severe environmental conditions.

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
1.2 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

Klystron

X-ray radiationInterelectrode capacitances
Max plate voltage
330 V
Max cathode current
55 mA

Microwave-device section. Standard promoted fields contain the closest directly equivalent published anode/beam limits; device-specific quantities are preserved in TUBE_SECTION_PARAMETER.

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

1953 RFT Rundfunk Technik

Published operating points and test conditions from this source.

SECTION 1

Klystron

Other

  • HeaterVoltageNominal

    6.3 V

    Nominal

  • HeaterCurrentNominal

    1.2 A

    Nominal

  • MaximumResonatorVoltage

    330 V

  • MaximumResonatorCurrent

    55 mA

Characteristic

  • FrequencyRange

    8.7 to 9.6 GHz

    Published operating range

  • OutputPowerMinimum

    0.015 W

    Typical range

Data set 02

1963 Ferranti

Published operating points and test conditions from this source.

SECTION 1

Klystron

Other

  • Heater voltage

    6.3 V

    Nominal

  • Heater voltage absolute limits

    5.7 to 6.9 V

  • Heater current

    1.2 A

    Nominal ±10%

  • Maximum resonator voltage

    350 V

  • Maximum resonator current

    55 mA

  • Maximum negative reflector voltage

    500 V

    Magnitude; reflector negative

  • Maximum heater-cathode voltage

    45 V

  • Maximum body temperature

    200 C

  • Reflector voltage at 250 V resonator

    -120 to -40 V

    Mode 6 3/4

  • Typical resonator current at 250 V

    33 mA

  • Power output at 250 V

    12 to 66 mW

  • Reflector voltage at 300 V resonator

    -200 to -80 V

    Mode 5 3/4

  • Resonator current at 300 V

    41 to 45 mA

  • Power output at 300 V

    40 to 120 mW

Characteristic

  • Maximum reflector current

    5 uA

    Typical table maximum

  • Electronic tuning range at 250 V

    30 to - Mc/s

    Average with 30 Mc/s minimum

  • Electronic tuning range at 300 V

    20 to - Mc/s

    Average with 20 Mc/s minimum

  • Temperature coefficient

    -100 to 50 kc/s/C

  • Noise

    <3e-14 W/Mc/s/mW

    RF noise metric

  • Maximum tuner resetting error

    1 Mc/s

  • Maximum tuner side-thrust error

    0.5 Mc/s

Frequency

  • Operating frequency

    8500 to 9600 Mc/s