Tube-number record
LD-550A
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BrandNippon Electric Co., Ltd.
ClassTraveling Wave Tube CW Amplifier
BaseWaveguide
Filament6.3 V @ 730 mA
Construction
Primary TypeOther / special
Envelope0.25 Kg
Base MaterialTube Mount: 4.6 Kg
SectionsPPM Focused
Filament / Heater
Heater NotesUnipotential oxide coated cathode
Absolute Maximum Ratings
Plate Voltage3400 V
Plate Dissipation56 W
Grid 2 Voltage3400 V
Grid 1 Voltage-20 V
Cathode Current35 mA
Audio Performance
Key Features
- PPM Focused
- Field Replaceable
- Depressed Collector Operation
- Convection Cooled
- Long Life
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Typical Operation at 6860 Mc/s | 2500 V | — | — | — | 35 mA |
Application Notes
Convection cooling is sufficient when the tube is used in a horizontal position. For any other mounting position, forced air may be required to maintain collector seal temperature below 130°C. Helix current increases with tube life; 2 mA indicates end of life.
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