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4KM50000LA3

Four-cavity magnetically focused 400–610 MHz power klystron for UHF television visual, FM, aural-TV, and tropospheric-scatter transmitters.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 7.5 V / -

Description

The Eimac 4KM50,000LA3 is a four-cavity, magnetically focused, power-amplifier klystron designed for use at frequencies from 400 to 610 megacycles. It is suitable for use in UHF television visual ser- vice and may also be used for FM, for aural TV, or for tropospheric- scatter communications service. When adjusted for narrow-band CW operation this klystron will de- liver a minimum output power of 10 kilowatts with a power gain of 50 decibels. In television visual service it will provide more than 10 kilowatts of peak synchronizing power with a power gain of 30 deci- bels. The random AM noise is more than 50 decibels below black level. The 4KM50,000LA3 employs the Eimac Modulating Anode which provides an effective means of protecting the tube from 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 tuning range and permits external cavity loading for broadband applications. For spares or replacements, only the basic vacuum tube, without cavities, need be purchased. Eimac Klystron Amplifier Circuit Assembly H~143 has beendesigned for use withthe 4KMS50,000LA3 to cover the specific frequencyrange. This assembly includes a klystron supporting structure, magnetic focusing coils, tuning cavities, adjustable load couplers for the sec- ond, third and output cavities and an Eimac SK-110 Air System Socket. CHARACTERISTICS ELECTRICAL

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 4KM50,000LA3 is a four-cavity, magnetically focused,
liver a minimum output power of
50 a
liver a minimum output power of 10 kilowatts with a power gain of 50
kilowatts of peak synchronizing power with a power gain of
30 kilowatts
kilowatts of peak synchronizing power with a power gain of 30 deci-
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
610 megacycles
Frequency Range (H-143 Assembly) 400 to 610 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
50 volts
Prefocus-Coil: Voltage - - - - - 0 to 50 volts
Current
5 amperes
Current - - - - - 0tol.5 amperes
Voltage
500 volts
Voltage - - - - - 0 to 500 volts
Current
2.5 amperes
Current - - - - - 0to?2.5 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
Frequency
610 megacycles
Frequency - - - - 400 610 megacycles
Output Power
12 kilowatts
Output Power - - - - 13.1 12.0 kilowatts
Driving Power
50 watt
Driving Power - - - - .050 .050 watt
D-C Beam Current
1.8 amperes
D-C Beam Current - - - - 1.8 1.8 amperes
D-C Collector Current
1.72 amperes
D-C Collector Current - - - - 1.71 1.72 amperes
Focus-Electrode Voltage
211 volts
Focus-Electrode Voltage -201 -211 volts
Prefocus Coil
0.97 ampere
Prefocus Coil - - - - 1.0 0.97 ampere
in Series
2 amperes
in Series 2.0 2.0 amperes
___—RF
452 SECOND
___—RF-452 SECOND