Tube-number record
HR8
0 archive entries
HR8 is a tube type in the TubeDatabase archive (class: Rectifier). Recorded specifications: brand Ferranti, year 1954, construction Rectifier, socket Octal, and maximum plate voltage 14000 V. The archive does not yet hold a photographed example of this type.
BrandFerranti
ClassRectifier
BaseOctal
Filament4 V @ 1250 mA
Construction
Primary TypeRectifier
Rectifier TypeHalf-Wave
EnvelopeGlass
Sections1
Filament / Heater
Heater NotesIndirectly heated
Absolute Maximum Ratings
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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