4CM2500KG_11 Datasheet, PDF (1/14 Pages) Communications & Power Industries, Inc. – MULTI-PHASE COOLED POWER TETRODE

The EIMAC 4CM2500KG is a ceramic/metal, multi-
phase (water/vapor) cooled power tetrode de-
signed for very high power rf service.
The 4CM2500KG has a high density thoriated
tungsten mesh filament mounted on water-cooled
supports. Pyrolytic graphite control and screen
grids are used to provide stability at high dissipa-
tion. The maximum anode dissipation rating is
2500 kilowatts.
Large diameter coaxial control grid and cathode
terminals allow enhanced VHF performance. Fila-
ment power and filament support cooling water are
supplied through connectors which allow for quick
tube installation and replacement.
MULTI-PHASE COOLED
POWER TETRODE
4CM2500KG
Characteristics¹
ELECTRICAL
Filament: Thoriated Tungsten Mesh
Voltage
15.5 V
Current at 15.5 Volts (nominal)
640 A
Frequency of Maximu Ratings (CW)
130 MHz
Maximum Useful Frequency
Over 200 MHz
Amplification Factor, Average, Grid to Screen 6
Direct Interelectrode Capacitances (grounded cathode):
Cin
1110 pF
Cout
150 pF
Cgp
5.5 pF
Direct Interelectrode Capacitances (grounded grid and screen)²
Cin
385 pF
Cout
152 pF
C_PK
0.07 pF
MECHANICAL:
Net Weight
161 lb.; 73.0 kg
Gross Weight
340 lbs; 154 kg
Operating Position
Vertical, Base Down
Cooling
Water and Forced Air
Maximum Overall Dimensions:
Length
18.75 in; 47.62 cm
Diameter
17.03 in; 43.26 cm
Maximum Operating Temperature,
Envelope and Ceramic/Metal Seals 200°C
Available Filament Power Connectors (not supplied with tube):
Filament Power/Water Connector (2 required):
EIMAC SK-2310
Filament rf Connector (1 required):
EIMAC SK-2315
Available Anode Cooling Water Connectors (not supplied with
tube):
Note: 2 connectors are required per tube
EIMAC SK-2322 or EIMAC SK-2323
The values listed above represent specified limits for the product and are subject to change. The data should be used for basic
information only. Formal, controlled specifications may be obtained from CPI for use in equipment design.
For information on this and other CPI products, visit our website at: www.cpii.com,
or contact: CPI MPP, Eimac Operation, 607 Hansen Way, Palo Alto, CA 94303
telephone: [phone]. fax: [phone] | email: [e-mail]
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