3CX4500F3

Forced-air-cooled ceramic/metal power triode for amplifier, oscillator, and modulator service. Rated for 6 kW plate dissipation and 9 kV plate voltage, with published RF output around 15 kW.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 7 V / 78 A

Description

The Svetlana™ 3CX4500F3/YU108 is a high-performance ceramic/metal power triode designed for use in amplifier, oscillator, or modulator service. A modern mesh filament is used, replacing the old-fashioned hairpin construction. The improved mesh filament design ensures better mechanical rigidity and long lasting concentricity of the filament, contributing to longer life. Flexible leads connect to the filament terminals and a flange is connected to the grid. The flange provides a convenient way to mount the tube. The Svetlana 3CX4500F3/YU108 is manufactured in the Svetlana Electron Devices complex in St. Petersburg, Russia. Svetlana has achieved the improved performance described above with exact replacement compatibility with the 3CX4500F3/YU108 manufactured in the United States. Characteristics Svetlana Outline drawing Electrical Filament: Thoriated-tungsten mesh B A Voltage 7.0± 0.35 V S Anode Cooler Current @ 7.0V 78 A & Terminal R Amplification factor (average) 22 L Direct interelectrode capacitances, with filament grounded*: P Input 35.0 pF C Output 0.9 pF Grid Flange Feedback 20 pF F

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 V
Nominal heater current: 78 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

Triode

X-ray radiationInterelectrode capacitances

Amplification factor: 22
Max plate voltage: 9000 V
Max plate dissipation: 6000 W
Max grid dissipation: 300 W
Max cathode current: 2.75 A

Promoted maximum ratings and characteristics from source; additional published values retained as parameters.

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

199X Svetlana

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristics

Voltage 7.0±
0.35 V
power triode designed for use in amplifier, oscillator, or modulator
Current @
7 V
power triode designed for use in amplifier, oscillator, or modulator
Input
35 pF
power triode designed for use in amplifier, oscillator, or modulator
Output
0.9 pF
power triode designed for use in amplifier, oscillator, or modulator
Feedback
20 pF
power triode designed for use in amplifier, oscillator, or modulator
Maximum frequency for full ratings (CW)
75 MHz
power triode designed for use in amplifier, oscillator, or modulator

Other

Plate dissipation
6000 W
Maximum Ratings:
Grid dissipation
300 W
Maximum Ratings:
DC grid voltage
-1000 V
Maximum Ratings:
DC grid current
800 mA
Maximum Ratings:
(Frequencies to
30 MHz
Typical Operation ELECTRON DEVICES
DC plate current
2.75 A
Typical Operation ELECTRON DEVICES
DC grid voltage
-705 V
Typical Operation ELECTRON DEVICES
DC grid current
680 mA
Typical Operation ELECTRON DEVICES
Peak positive RF grid voltage
346 V
Typical Operation ELECTRON DEVICES
Driving power
710 W
Typical Operation ELECTRON DEVICES
Grid resistor
1040 Ohms
Typical Operation ELECTRON DEVICES
Plate input power
22000 W
Typical Operation ELECTRON DEVICES
Plate dissipation
4800 W
Typical Operation ELECTRON DEVICES
Plate output power
15000 W
Typical Operation ELECTRON DEVICES
Approximate load impedance
1437 Ohms
Typical Operation ELECTRON DEVICES