Tube-number record
HIGH VACUUM DIODE
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BrandITT (International Telephone and Telegraph Corporation)
ClassPower Rectifier
BaseSpecial / none
Construction
Primary TypeDiode
Rectifier TypeHigh Vacuum
EnvelopeHeavy wall external anode
Base MaterialMetal/Glass
SectionsSingle
Filament / Heater
MaterialPure tungsten
Absolute Maximum Ratings
Plate Voltage45000 V
Plate Dissipation20000 W
Cathode Current3000 mA
Audio Performance
Key Features
- Pure tungsten filament
- Rugged bifilar helix construction
- Water-cooled external anode
- High thermal inertia anode
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Rectifier Service | 45000 V | — | — | — | 3000 mA |
| Surge Limiting Diode Operation | 50000 V | — | — | — | 10000 mA |
Application Notes
The F-8208 is designed for rectifier service or in special circuits where the limited emission characteristics of pure tungsten cathodes are desirable. Air flow up to 35 cfm may be required for seal cooling.
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