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

Specialized - Klystron ·Klystron

SY11

Water-cooled high-power amplifier klystron for continuous-wave X-band service around 8.7–10 GHz, producing kilowatt-class microwave output.

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

Description

Ferranti SY11 is a high-power water-cooled amplifier klystron for continuous-wave 3 cm microwave service. It operates across approximately 8.7-10 GHz and is rated to 14 kV beam voltage and 850 mA beam current with output in the kilowatt range.

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
-
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

Klystron

X-ray radiationInterelectrode capacitances
Max plate voltage
14000 V
Max cathode current
850 mA

Klystron beam/resonator anode voltage is promoted to MaxPlateVoltage where applicable; original published labels and conditions are retained in parameter rows.

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

1963 Ferranti

Published operating points and test conditions from this source.

SECTION 1

Klystron

Other

  • Heater voltage

    4.5 to 6 V

    Published operating range

  • Heater current

    10 A to 10.5 A

    Published operating range

  • Minimum heating delay time

    5 min

    Before full power

  • Maximum beam voltage

    14 kV

    Beam supply

  • Maximum beam current

    850 mA

    Beam current

  • Minimum power output

    1800 W

    At 14 kV beam voltage, published minimum

  • Typical beam voltage, 1 kW

    9.4 to 10.6 kV

    Approx. 1 kW output

  • Typical beam current, 1 kW

    450 to 550 mA

    Approx. 1 kW output

  • Typical output power, 1 kW condition

    1000 W

  • Typical beam voltage, 2 kW

    12.8 to 13.6 kV

    Approx. 2 kW output

  • Typical beam current, 2 kW

    720 to 790 mA

    Approx. 2 kW output

  • Typical output power, 2 kW condition

    2000 W

  • Maximum cavity block current

    200 mA

    Operational safeguard

  • Maximum output VSWR

    2

    Recommended limit

Frequency

  • Operating frequency

    8700 to 10000 Mc/s

    3 cm band

  • Tuning range

    45 Mc/s

    ±10 Mc/s tolerance stated

Characteristic

  • Efficiency

    19 to 22 %

    Typical

  • High-level RF gain, 1 kW

    10.5 to 12.5 dB

  • High-level RF gain, 2 kW

    12 to 14 dB