Tube-number record
HR8
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BrandFerranti
ClassRectifier
BaseOctal
Filament4 V @ 1250 mA
Construction
Primary TypeRectifier
Rectifier TypeHalf-Wave
EnvelopeGlass
Sections1
Filament / Heater
Heater NotesIndirectly heated
Absolute Maximum Ratings
Plate Voltage14000 V
Cathode Current50 mA
Audio Performance
Key Features
- Indirectly heated
- High Voltage Rectifier
- International Octal Base
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Capacitor input filter, 50 c/s | 5000 V | — | 4000 | — | 50 mA |
Application Notes
The Valve may be operated at a P.I.V. (working) of 15 kV [P.I.V. (no load) 16.5 kV] provided that the maximum Rectified Current load is reduced to 40 mA., and the maximum Peak Anode Current is restricted to 300 mA. Under these conditions the supply impedance should be increased to a minimum of 5000 ohms.
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