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Power - Triode (over 1000V 100W) ·Triode

3X2500F3

Forced-air-cooled external-anode medium-mu power triode for amplifier, oscillator, and modulator service.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 7.5 V / 53 A

Description

The EIMAC 3X2500F3 is a forced-air-cooled external-anode medium-mu power triode for amplifier, oscillator, and modulator service.

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: 53 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

Transconductance: 0.02 S
Amplification factor: 20
Max plate voltage: 6000 V
Max plate dissipation: 2500 W
Max grid dissipation: 150 W
Max cathode current: 2.5 A

Highest published CW/service maximums promoted; amplification factor is published as a range and retained in 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

1962 Eimac

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

Frequency for Maximum Ratings
30 MHz
Filament/Heater Current
49 A to 54 A
Amplification Factor
19 to 26

Other

Maximum DC Plate Current
2.5 A
Class-C FM/Telegraphy and Class-B maximum
Typical DC Plate Voltage
4000 V
Class-C FM/Telegraphy
Typical Plate Output Power
7500 W
Class-C FM/Telegraphy
FCC Carrier Power, Plate Modulated
5000 W
Published FCC rating
FCC Carrier Power, Grid-Modulated or Linear
1250 W
Published FCC rating

Capacitance

Grid-Plate Capacitance
16.8-23.2 pF
Published min-max
Grid-Filament Capacitance
29.2-40.2 pF
Published min-max
Plate-Filament Capacitance
0.6-1.2 pF
Published min-max

Data set 02

1965 Eimac Tube Manual

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Grid-Plate Capacitance
20 pF
Grid-Filament Capacitance
31 pF
Plate-Filament Capacitance
1.5 pF
Transconductance
0.02 A/V
Frequency Maximum
30 MHz
Typical RF Output Power
7500 W
FCC Plate-Modulated Carrier Rating
5000 W
FCC Linear Carrier Rating
1250 W