3CX400U7
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BrandEIMAC
ClassHigh-Mu UHF Transmitting Triode
BaseSpecial Coaxial
Filament6.3V @ 3mA
Construction
Primary TypeTriode
EnvelopeMetal/Ceramic
Base MaterialMetal
SectionsSingle
Filament / Heater
MaterialOxide-Coated
Warm-up Time60s
Heater NotesHeater voltage should be reduced at frequencies above 300 MHz due to transit-time effects.
Absolute Maximum Ratings
Plate Voltage1500 V
Plate Dissipation400 W
Grid 1 Voltage-100 V
Cathode Current400 mA
H-C Voltage150 V
Audio Performance
Key Features
- High-mu triode
- Beam-forming cathode
- Control grid geometry
- All metal/ceramic construction
- External anode
- Forced-air cooling
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Cathode Driven, Class C Telegraphy/FM, 850 MHz | 1500V | 29000 | - | 240 | 400mA |
Application Notes
Designed for use above 200 MHz, particularly in the 806 to 950 MHz spectrum for land mobile services. Requires forced-air cooling of 11.5 cfm at full dissipation.
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