Electron Tubes for Industrial, Broadcast and Ham Radio Applications
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4CX250B 7203
The
4CX250B / 7203 vacuum tube has a maximum plate dissipation
rating of 250 watts and a maximum input-power rating of 500 watts.
The 4CX250B / 7203 is designed to operate with a heater voltage of
6.0 volts.
|
Filament
|
Thoriated Tungsten
|
|
Filament Voltage
|
6.0V
|
|
Filament Current
|
2.6A
|
|
Capacitances
(Gnd.Kath.
Connection)
|
Input
|
15.7pF
|
|
Output
|
4.5pF
|
|
Feed-through
|
0.04pF
|
|
Capacitances
(Gnd.Grid.
Connection)
|
Input
|
13.0pF
|
|
Output
|
4.5pF
|
|
Feed-through
|
0.04pF
|
|
Amplification Factor
|
5
|
|
Screen Dissipation
(Max.)
|
12W
|
|
Plate Dissipation
(Max.)
|
250W
|
|
Grid Dissipation
(Max.)
|
2W
|
|
Frequency for Max.
Ratings(CW)
|
500MHz
|
|
Base
|
Special, coaxial
|
|
Cooling
|
Forced Air
|
|
Maximum Seal&Anode
Core Temperature
|
250℃
|
|
Weight(approximate)
|
113gm
|
|
Operating Position
|
Vertical, base up or
down
|
|
Class of Operation
|
Type of Service
|
Max. Ratings
|
TYPICAL OPERATION
|
|
Plate Voltage
(V)
|
Plate Current
(A)
|
Plate Voltage
(V)
|
Plate Current
(A)
|
Drive Power
(W)
|
Output Power
(W)
|
Screen
Voltage
(volts)
|
|
C
|
RF Amplifier
|
2000
|
0.25
|
2000
|
0.25
|
2.9
|
390
|
300
|
|
C
|
RF Amplifier Plate
Modulated
|
1500
|
0.20
|
1500
|
0.20
|
1.7
|
235
|
250
|
|
AB1
|
RF Amplifier Plate
Modulated
|
2000
|
0.25
|
2000
|
0.25
|
-
|
300
|
350
|
|
AB1
|
RF Linear Amplifier
|
2000
|
0.25
|
2000
|
0.15
|
-
|
65+
|
350
|
|
AB1
|
AF Amplifier or
Modulator
|
2000
|
0.25
|
2000
|
0.50*
|
-
|
600*
|
350
|
*Two tubes
GREENSTONE USA
Copyright © 2001 GREENSTONE USA All rights reserved.
Revised:
October 20, 2010
| 
