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Specialized - Klystron ·Klystron

SY41

High-power four-cavity broadband klystron amplifier for continuous-wave X-band operation, producing multi-kilowatt output with water cooling.

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

Description

Ferranti SY41 is a high-power four-cavity broadband amplifier klystron for CW X-band operation. It is rated to 13 kV, 700 mA and 3 kW output, with water cooling and typical multi-kilowatt operation.

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
13000 V
Max cathode current
700 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 power

    27.6 to 37.2 W

  • Heater resistance at 32 W

    3.1 to 3.4 ohm

  • Cold heater resistance

    0.2 ohm

  • Maximum switch-on surge current

    9 A

  • Minimum heating delay time

    3 min

  • Maximum beam voltage

    13 kV

  • Maximum beam current

    700 mA

  • Maximum power output

    3 kW

  • Typical beam voltage

    13 kV

  • Typical beam current

    530 to 600 mA

  • Magnetic field

    1500 to 1700 gauss

  • Typical output power

    2000 W

    OCR table indicates approximately 2 kW nominal

  • Maximum cavity block current

    200 mA

    Operational safeguard

  • Maximum output VSWR

    2

    Recommended limit

Frequency

  • Operating frequency

    8000 to 9000 Mc/s

Characteristic

  • Valve bandwidth

    16 Mc/s

  • Efficiency

    33 to 38 %

  • RF gain

    32 to 47 dB

Cooling

  • Minimum block water flow

    1.5 L/min

    At 20 C

  • Minimum collector water flow

    6 L/min

    At 20 C