Tube-number record
8198/EM-778
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BrandEimac
ClassTraveling Wave Tube
BaseFlexible / flying leads
Filament6.3 V @ 600 mA
Construction
Primary TypeOther / special
EnvelopeCeramic and Metal
Base MaterialMetal
SectionsSingle
Filament / Heater
MaterialOxide coated
Warm-up Time60s
Heater NotesUnipotential cathode
Absolute Maximum Ratings
Plate Voltage3000 V
Grid 1 Voltage-40 V
Cathode Current25 mA
Audio Performance
Key Features
- Ruggedized
- Ceramic and Metal Construction
- Periodic permanent magnet focused
- Temperature compensated magnets
- Airborne application design
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Power Amplifier (5.0 to 11.0 GHz) | 2900 V | — | — | — | 23 mA |
Application Notes
The EM-778 is designed to be heat sink cooled by means of the mounting available and integral with the tube and PPM structure. Helix, collector and anode are internally connected to the tube body.
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