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

Specialized - Klystron ·Klystron

4KM50000LR

Four-cavity magnetically focused 755–985 MHz power-amplifier klystron delivering approximately 10 kW in narrowband or broadband operation.

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

Description

The Eimac 4KM50,000LR is a four-cavity, magnetically focused, power-amplifier klystron designed foruse at frequencies between 755 and 985 megacycles. This klystron will deliver a narrow-band CW output power of 10 kilowatts with a minimum power gain of 50 deci- bels. When adjusted for wide-band operation the 4KM50,000LR will deliver an output power of 10 kilowatts with a half-power bandwidth of 7 megacycles and a power gain of 30 decibels. This klystron employs the Eimac Modulating Anode which provides an effective means for protecting the tube against internal arcs when connected to the beam supply through a resistor. All tuning is accomplished outside of the vacuum envelope by means of external resonant cavities which enclose the cylindrical ceramic windows of the klystron. This design affords a wide tuningrange and permits external cavity loading for broadband applications. Forspares or replacements, only the basic vacuum tube, without cavities, need be purchased. EimacKlystron Amplifier Circuit Assembly H-141 has been designed for usewith the 4KM50,000LR to cover the specified frequencyrange. This assembly includes a klystron supporting structure, magnetic focusing coils, tuning cavities, adjustable load couplers for each cavity, and an Eimac SK-110 Air-System Socket.

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
7.5 V
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

No fixed ratings are recorded for this section.

Single electrical section; values mapped from printed ratings/characteristics. Klystron represented as SectionType Other because the canonical section vocabulary has no Klystron section type.

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 Eimac

Published operating points and test conditions from this source.

SECTION 1

Klystron

Other

  • The Eimac

    0 a

    The Eimac 4KM50,000LR is a four-cavity, magnetically focused,

  • and

    985 megacycles

    and 985 megacycles. This klystron will deliver a narrow-band CW

  • output power of

    50 kilowatts

    output power of 10 kilowatts with a minimum power gain of 50 deci-

  • deliver an output power of

    10 kilowatts

    deliver an output power of 10 kilowatts with a half-power bandwidth

  • of

    30 megacycles

    of 7 megacycles and a power gain of 30 decibels.

  • Heater: Voltage

    7.5 volts

    Heater: Voltage - - - - 7.5 volts

  • Current

    40 amperes

    Current - - - - 40.0 amperes

  • Maximum Starting Current

    80 amperes

    Maximum Starting Current - - 80.0 amperes

  • Voltage

    2 volts

    Voltage - - - - 2.0 volts

  • Current

    36 amperes

    Current - - - - 36.0 amperes

  • Output Power

    10 kilowatts

    Output Power - - - - 10 kilowatts

  • Frequency Range (H

    985 megacycles

    Frequency Range (H-141 Assembly) - 755 to 985 megacycles

  • Output

    50 ohm

    Output - - - - 3 1/8 inch, 50-ohm line

  • (Effective

    1961 A

    (Effective 10-20-61) Copyright 1961 by Eitel-McCullough, Inc. Printed in U.S.A.

  • Prefocus Coil: Voltage

    25 volts

    Prefocus Coil: Voltage - - - - - 0 to 25 volts

  • Current

    1.25 amperes

    Current - - - - - 0 to 1.25 amperes

  • Voltage

    400 volts

    Voltage - - - - - 0 to 400 volts

  • Current

    0 amperes

    Current - - - - - 0to4.0 amperes

  • D-C BEAM CURRENT

    2.5 AMPERES

    D-C BEAM CURRENT - - - - - 2.5 AMPERES

  • A-C GETTER CURRENT

    50 A

    A-C GETTER CURRENT - - - - - 50 AMPERES

  • FOCUS-ELECTRODE VOLTAGE

    500 VOLTS

    FOCUS-ELECTRODE VOLTAGE - - - - - -500 VOLTS

  • COLLECTOR DISSIPATION

    50 KILOWATTS

    COLLECTOR DISSIPATION - - - - - 50 KILOWATTS

  • Frequency

    762 megacycles

    Frequency 755 985 762 megacycles

  • Output Power

    10 kilowatts

    Output Power 12.1 11.5 10 kilowatts

  • Driving Power

    10 watts

    Driving Power 0.05 0.05 10 watts

  • D-C Beam Current

    1.9 amperes

    D-C Beam Current 1.76 1.76 1.9 amperes

  • Focus-Electrode Voltage

    175 volts

    Focus-Electrode Voltage -245 -245 ~-175 volts

  • Half Power Bandwidth

    7 megacycles

    Half Power Bandwidth - - - - 7 megacycles

  • Prefocus Coil

    1.1 amperes

    Prefocus Coil 1.06 1.03 1.1 amperes

  • Coil in Series

    3 amperes

    Coil in Series 3.0 3.0 3.0 amperes

  • MO MiM. MAX, ) LBes VP

    3 A

    MO MiM. MAX, ) LBes VP50 EXCERPT ANODE CATY A SHOWN, 3 »WI\ EOR % O D Tubila.

  • ol

    42 A

    ol 20.642 LY 42D A% - @ - * <

  • Pl

    1 A

    Pl .59 [ 1|LJ QECTION A-A SEcTiON BB