TubeDatabase
  • Tubes
  • Testers
  • Companies
  • Submit
  • About

Tube Database (7,341 tube types · 1,270 archive entries)

Pre (2,630 tube types), Other (2,603 tube types), Power (1,292 tube types), Rectifier (816 tube types)
DisclaimerA–Z indexIdentify your tubesTube variantsSubmit a tube
3CX400U7 vacuum tube outline illustration

Tube-number record

3CX400U7

0 archive entries

3CX400U7 is a tube type in the TubeDatabase archive (class: High-Mu UHF Transmitting Triode). Recorded specifications: brand EIMAC, year 1974, construction Triode, base Metal, socket Coaxial, maximum plate voltage 1500 V, and maximum plate dissipation 400 W. The archive does not yet hold a photographed example of this type.

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

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Cathode Driven, Class C Telegraphy/FM, 850 MHz1500 V29000—240400 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

Download PDF
Loading datasheet...

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

Filters

0 tubes found

Manufacturers

Brands

    0 results
    Heater Notes
    Heater 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