4CX250B-M Datasheet, PDF (1/7 Pages) Communications & Power Industries, Inc. – RADIAL BEAM POWER TETRODE

RADIAL BEAM POWER TETRODE
4CX250B/M
The Eimac 4CX250B/M is a ceramic/metal,
forced-air cooled external-anode tetrode with a
maximum anode dissipation rating of 250 Watts.
The 4CX250B/M is intended for use in applica-
tions where tight control of electrical specifica-
tions is required and replaces the 4CX250B in
all applications. This tube utilizes a ruggedized
internal structure and utilizes a welded anode cap
for improved reliability.
Characteristics¹
7203A
ELECTRICAL
Cathode: Oxide coated, Unipotential
Filament Voltage
6.0± 0.3 V
Current at 6.0 Volts
2.6 A
Direct Interelectrode Capacitances (grounded cathode)²
Cin
15.7 pF
Cout
4.5 pF
Cgp
0.04 pF
Amplification Factor, Average (screen-grid) 5
Frequency of Maximum Ratings (CW)
500 MHz
MECHANICAL:
Overall Dimensions:
Length
2.46 in; 62.5 mm
Diameter
1.64 in; 41.7 mm
Weight (approx.)
4 oz; 113 gm
Operating Postition
Any
Maximum Operating Temperature:
Ceramic/Metal Seals & Envelope
250° C
Anode Core
250° C
Cooling
Forced Air
Base
Special, 9-pin Jedec-B8-236
Recommended Air System Socket
SK-600 Series
Recommended Air Chimney
SK-606
1 _{Characteristics and operating values are based upon performance tests. These figures may change without notice as the result of additional data or product refinement.}
CPI MPP, Eimac Operation should be consulted before using this information for final equipment design.
2 _{Capacitance values are for a cold tube as measured in a special shielded fixture in accordance with Electronic Industries Association Standard RS-191.}
RANGE VALUES FOR EQUIPMENT DESIGN
Min.
Nom. Max.
Filament Current @ 6.0 Volts
Cathode Warm-up Time
2.3
--
2.9 Amperes
30
60
-- Seconds
Interelectrode Capacitance ¹ (grounded cathode circuit)
Cin
Cout
Cgp
14.2
--
17.2
pF
4.0
--
5.0
pF
--
--
0.06
pF
Interelectrode Capacitance ¹ (grounded grid circuit)
Cin
Cout
Cpk
--
13.0
--
pF
4.0
--
5.0
pF
--
0.01
--
pF
1 _{Capacitance values are for a cold tube as measured in a shielded fixture in accordance with Electronic Industries Assocation Standard RS-191.}
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]
July 2011
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