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BrandEIMAC (Division of Varian)
ClassRadial Beam Power Pentode
BaseEIMAC SK-291A (7-Pin Special)
Filament6V @ 17mA
Construction
Primary TypePentode
EnvelopeCeramic/Metal
Base MaterialMetal/Ceramic
SectionsSingle
Filament / Heater
MaterialOxide Coated
Warm-up Time5s
Heater NotesUnipotential cathode
Absolute Maximum Ratings
Plate Voltage6000 V
Plate Dissipation5000 W
Grid 2 Voltage1000 V
Grid 1 Voltage-250 V
Cathode Current2000 mA
Audio Performance
Key Features
- Ceramic/Metal construction
- Forced-air cooled
- Low input capacitance
- Broad-band linear amplifier
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class AB1, Grid Driven (Peak Envelope) | 5000V | 37000 | - | - | 1360mA |
| Class AB1, Grid Driven (Peak Envelope) | 5000V | 37000 | - | - | 1690mA |
| Class AB1, Grid Driven (Peak Envelope) | 6000V | 37000 | - | - | 1740mA |
Application Notes
Suitable for Class AB1 amplifier applications and broad-band linear amplifiers. Forced-air cooling must be applied before or simultaneously with electrode voltages.
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