Tube-number record

3CX400U7

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BrandEIMAC

ClassHigh-Mu UHF Transmitting Triode

BaseCoaxial

Filament6.3 V @ 3 mA

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	1500 V	29000	—	240	400 mA

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.

Datasheets

Datasheet: 3CX400U7.pdf

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Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.

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