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LD-550A

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BrandNippon Electric Co., Ltd.
ClassTraveling Wave Tube CW Amplifier
BaseWR-137 with UG-344/U flange
Filament6.3V @ 730mA

Construction

Primary TypeHelical line TWT
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

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Typical Operation at 6860 Mc/s2500V---35mA

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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