8974 Datasheet, PDF (1/1 Pages) Communications & Power Industries, Inc. – RF Amplifier

8974 / X-2159
The 8974 is a power tetrode designed for very high
powered frequency or high frequency broadcast
service and very low frequency communication in
the megawatt power range. The 8974 has a two
section thoriated tungsten filament mounted on
water-cooled supports. The two sections may
be fed in quadrature to reduce hum contributed
by an arc ac power source. The maximum anode
dissipation rating is 1500 kW steady state. Large
diameter coaxial terminals are used for the control
grid and the RF filament terminals. Filament power
and filament support cooling water connections
are made through three special couplings with
threaded clamping rings.
Characteristics
Plate Dissipation (Max.)
Screen Dissipation (Max.)
Grid Dissipation (Max.)
Frequency for Max. rating (CW)
Amplification Factor
Filament/Cathode
Voltage
Current
Capacitance
Input
Output
Feedthrough
Capacitance
Input
Output
Feedthrough
Cooling
Base
Air Socket
Air Chimney
Boiler
Length
Diameter
Weight
1,500 Kilowatts
15.0 Kilowatts
4.0 Kilowatts
30 MHz
4.5
Thoriated Tungsten
16.3 Volts
600 Amps
Grounded Cathode
1600 pf
250 pf
6.0 pf
Grounded Grid
675 pf
260 pf
1.0 pf
Water and Forced Air
Special Coaxial
N/A
N/A
N/A
23.75 in; 60.30 cm
17.03 in; 43.30 cm
175.0 lb; 80.0 kg

Maximum Ratings Typical Operation
Class of Type of Service Plate Plate Plate Screen Plate Drive Output
Operation
Voltage Current
Voltage Voltage Current Power Power

(Volts) (Amps)
(Volts) (Volts) (Amps) (Watts) (kiloWatts)
C
RF Amplifier
C
RF Amplifier Plate Modulated
AB1
RF Linear Amplifier
AB1 AF Amplifier or Modulator
22,500 125
17,500
100
22,500 125
22,500 125
21,500 1,000
125
7,000 2,158.0
17,500 1,000
95.0
6,465 1,384.0
20,000 1,500
86.5
--- 1,225.0
17,500 1,500
146
--- 2,015.0
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 MPP products, visit our website at: www.cpii.com,
or contact: CPI Microwave Products Division, Eimac Operation,607 Hansen Way, Palo Alto, CA 94303
telephone: [phone]. fax: [phone] | email: [e-mail]