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)
aB2
cathode driven RF linear amplifier (30 MHz)
2,200
0.35
2,000
---
0.50
26
0.587
aB2
cathode driven RF linear amplifier (150 MHz)
2,200
0.35
2,000
---
0.40
17.5
0.526
aB2
cathode driven RF linear amplifier (432 MHz)
2,200
0.35
2,000
---
0.50
27
0.505
---
pulse modulator or regulator
4,500
6.0
---
---
---
---
---
The 3CX400A7/8874 is a compact high-mu power
triode intended for use in zero bias Class B ampli-
fiers in audio or RF applications. Operation with
zero bias simplifies circuitry and cathode driven
operation is attractive since a power gain as high
as twenty can be obtained.
3cx400a7/8874
For information on this and other CPI products, visit our website at: www.cpii.com,
or contact: CPI MPP Division, Eimac Operations, 607 Hansen Way, Palo Alto, CA 94303
telephone
: 1(800) 414-8823. fax: (650) 592-9988 | email: powergrid@cpii.com
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.
cHaRacteRistics
Plate Dissipation (Max.)
400 Watts
Screen Dissipation (Max.)
---
Grid Dissipation (Max.)
5 Watts
Frequency for Max. rating (CW)
500 MHz
Amplification Factor
240
Filament/Cathode
Oxide Coated
Voltage
6.3 Volts
Current
3.0 Amps
Capacitance
Grounded Grid
Input
20.5 pf
Output
6.0 pf
Feedthrough
0.3 pf
Capacitance
---
Input
--- pf
Output
--- pf
Feedthrough
--- pf
Cooling
Forced Air
Base
11 pin with ring
Air Socket
SK-1900
Air Chimney
SK-606
Boiler
---
Length
2.14 in; 54.40 mm
Diameter
1.64 in; 41.70 mm
Weight
4.3 oz; 122 gm
