3CX2500H3

Forced-air-cooled ceramic/metal power triode for industrial RF heating, RF amplification, and modulator service. Rated for 2.5 kW plate dissipation and about 10 kW typical industrial-RF output at 6 kV.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 7.5 V / 52 A

Description

Forced-air-cooled ceramic/metal industrial RF-heating power triode.

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: 52 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: 400 W
Max cathode current: 2.5 A

Maximum ratings promoted from the printed service-rating tables; typical operating values are preserved 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

1962 Eimac

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Maximum plate voltage
6000 V
Maximum plate/cathode current
2.5 A
Maximum plate dissipation
2500 W
Maximum grid dissipation
400 W

Data set 02

1965 Eimac Tube Manual

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

Heater/filament voltage
7.5 V
Heater/filament current
50 A
Amplification factor
20
Transconductance
20000 uS

Capacitance

Input/grid-cathode capacitance
35 pF
Output/plate-cathode capacitance
0.9 pF
Feedback/grid-plate capacitance
20 pF

Other

Maximum plate voltage
6000 V
Maximum plate dissipation
2500 W
Maximum grid dissipation
150 W
Maximum plate/cathode current
2.5 A
Frequency for maximum ratings
75 MHz
Industrial RF plate input maximum
12500 W
IndustrialRF
Typical industrial RF plate voltage
6000 V
IndustrialRF
Typical industrial RF plate output
10000 W
IndustrialRF

Data set 03

199X Svetlana

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristics

Current @
7.5 V
or modulator service. The ceramic is glazed to
Input
36 pF
or modulator service. The ceramic is glazed to
Output
0.9 pF
or modulator service. The ceramic is glazed to
Feedback
20 pF
or modulator service. The ceramic is glazed to
Maximum frequency for full ratings (CW)
75 MHz
or modulator service. The ceramic is glazed to

Other

DC plate voltage
6000 V
Maximum Ratings
DC plate current
2.5 A
Maximum Ratings
Plate dissipation
4000 W
Maximum Ratings
Grid dissipation
150 W
Maximum Ratings
DC grid voltage
-1000 V
Maximum Ratings
DC grid current
400 mA
Maximum Ratings
(Frequencies to
30 MHz
Typical Operation
DC plate voltage 4000 5000
6000 V
Typical Operation
DC plate current 2.5 2.5
2.08 A
Typical Operation
DC grid voltage* -300 -450
-500 V
Typical Operation
DC grid current* 245 265
180 mA
Typical Operation
Peak RF grid voltage* 580 750
765 V
Typical Operation
Driving Power* 142 197
136 W
Typical Operation
Grid dissipation* 68 78
46 W
Typical Operation
Plate input power 10,000 12,500
12500 W
Typical Operation
Plate dissipation 2500 2500
2500 W
Typical Operation
Plate output power 7500 10,000
10000 W
Typical Operation
DC plate voltage
5500 V
Maximum Ratings
DC plate current
2 A
Maximum Ratings
Plate dissipation
2670 W
Maximum Ratings
Grid dissipation
150 W
Maximum Ratings
DC grid voltage
-1000 V
Maximum Ratings
(Frequencies to
110 MHz
Typical Operation
DC plate voltage 4000 4500
5000 V
Typical Operation
DC plate current 1.67 1.47
1.25 A
Typical Operation
DC grid voltage -450 -500
-550 V
Typical Operation
DC grid current* 180 140
150 mA
Typical Operation
Peak RF grid voltage* 685 715
760 V
Typical Operation
Driving power 125 100
115 W
Typical Operation
Grid dissipation* 43 30
32 W
Typical Operation
DC plate input power 6670 6615
6250 W
Typical Operation
Plate dissipation 1670 1315
950 W
Typical Operation
Plate output power 5000 5300
5300 W
Typical Operation
DC plate voltage
6000 V
Maximum Ratings (per tube)
DC plate current
2.5 A
Maximum Ratings (per tube)
Plate dissipation
4000 W
Maximum Ratings (per tube)
Grid dissipation
150 W
Maximum Ratings (per tube)
DC grid voltage
-1000 V
Maximum Ratings (per tube)
DC plate voltage 4000 5000
6000 V
Typical Operation (two tubes sinusoidal waveform)
Zero-signal DC plate current* 0.6 0.5
400 mA
Typical Operation (two tubes sinusoidal waveform)
Maximum-signal DC plate current 4.0 3.2
3 A
Typical Operation (two tubes sinusoidal waveform)
DC grid voltage ** -150 -190
-240 V
Typical Operation (two tubes sinusoidal waveform)
Peak AF grid voltage (per tube)* 340 360
390 V
Typical Operation (two tubes sinusoidal waveform)
Maximum-signal peak driving power* 340 230
225 W
Typical Operation (two tubes sinusoidal waveform)
Maximum-signal nominal driving power* 170 115
113 W
Typical Operation (two tubes sinusoidal waveform)
Load resistance, plate-to-plate 2200 3600
4650 Ohms
Typical Operation (two tubes sinusoidal waveform)
Maximum-signal plate output power 11,000 11,000
13000 W
Typical Operation (two tubes sinusoidal waveform)
Filament current at
7.5 V
Typical Operation (two tubes sinusoidal waveform)
Input 29.2
40.2 pF
Typical Operation (two tubes sinusoidal waveform)
Output 0.6
1.2 pF
Typical Operation (two tubes sinusoidal waveform)
Feedback 16.8
23.2 pF
Typical Operation (two tubes sinusoidal waveform)
DC grid bias for Eb =3000, Ib =0.83A -67
-100 V
Typical Operation (two tubes sinusoidal waveform)
the ceramic/metal seals below
250 ˚C
Typical Operation (two tubes sinusoidal waveform)
temperatures below
225 ˚C
Typical Operation (two tubes sinusoidal waveform)
temperature of
40 ˚C
Typical Operation (two tubes sinusoidal waveform)