8757
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BrandEimac
ClassPlanar Triode
BaseCoaxial
Filament6.3V @ 1300mA
Construction
Primary TypeTriode
EnvelopeCeramic/Metal
Sections1
Filament / Heater
Heater NotesOxide Coated, Unipotential
Absolute Maximum Ratings
Plate Voltage1000 V
Plate Dissipation150 W
Grid 1 Voltage-400 V
Cathode Current250 mA
Audio Performance
Key Features
- Miniature ceramic/metal construction
- Ruggedized for airborne and space applications
- Frequency-stable
- Arc-resistant cathode
- Supplied without radiator
- Multiple cooling options (conduction, convection, liquid)
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| CW RF Power Amplifier/Oscillator | 1000V | 38000 | - | 75 | 160mA |
| Grid-Pulsed r-f Power Oscillator (3.5 GHz) | 2500V | - | - | - | 5000mA |
Application Notes
The 8757 is suitable for use as an amplifier, oscillator, or frequency multiplier in CW, grid- or plate-pulsed modes. It can also function as a modulator or regulator tube. Radiators for forced-air cooling permitting anode dissipation up to 150 watts are available separately.
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