Tube-number record
RW 1120
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RW 1120 is a tube type in the TubeDatabase archive (class: Power Traveling Wave Tube). Recorded specifications: brand Siemens, construction Other / special, base Metal, socket Waveguide, maximum plate voltage 3500 V, and maximum plate dissipation 200 W. The archive does not yet hold a photographed example of this type.
BrandSiemens
ClassPower Traveling Wave Tube
BaseWaveguide
Filament6.3 V @ 800 mA
Construction
Primary TypeOther / special
EnvelopeMetal Case
Base MaterialMetal
SectionsSingle
Filament / Heater
Heater NotesIndirect heating; Metal capillary dispenser cathode
Absolute Maximum Ratings
Plate Voltage3500 V
Plate Dissipation200 W
Grid 2 Voltage2000 V
Grid 1 Voltage-150 V
Cathode Current80 mA
H-C Voltage3500 V
Audio Performance
Key Features
- Conduction cooled
- Integrated periodic permanent magnet focusing
- Depressed collector operation
- Waveguide RF coupling
- Replaceable tube/magnet assembly
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| CW @ 12 GHz | 2500 V | — | — | — | 60 mA |
Application Notes
Designed for frequency range 10.7 to 13.2 GHz with 20W average CW power. Heater and cathode operate at approximately 3500V potential relative to ground. Protection relay for helix current required.
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