Tube-number record
SHIELDED-GRID TRIODE
0 archive entries
SHIELDED-GRID TRIODE is a tube type in the TubeDatabase archive (class: Switch Tube). Recorded specifications: brand Machlett, year 1964, construction Triode, maximum plate voltage 16000 V, and maximum plate dissipation 5000 W. The archive does not yet hold a photographed example of this type.
BrandMachlett
ClassSwitch Tube
Filament6 V @ 60 mA
Construction
Primary TypeTriode
EnvelopeCeramic-Metal
SectionsSingle
Filament / Heater
Heater NotesStarting current maximum 300 Amps. Warmup time 10 minutes.
Absolute Maximum Ratings
Plate Voltage16000 V
Plate Dissipation5000 W
Grid 1 Voltage-300 V
Cathode Current75000 mA
Audio Performance
Key Features
- Shielded-grid design
- Unipotential oxide-coated cathode
- Low grid-plate capacitance
- Transient arc protection
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Pulse Modulator/Amplifier | 8000 V | — | — | 125 | 10000 mA |
| Pulse Modulator/Amplifier | 16000 V | — | — | 125 | 55000 mA |
Application Notes
Designed primarily to operate as switch tubes in hard-tube pulse modulators for radar and similar applications. Capable of 150 kW pulse output power.
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