Tube-number record
705A
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BrandStandard Telephones and Cables Limited
ClassHalf-Wave High-Vacuum Rectifier
BaseSpecial / none
Construction
Primary TypeRectifier
Rectifier TypeVacuum
EnvelopeGlass
Base MaterialB4A
Sections1
Filament / Heater
MaterialThoriated tungsten
Absolute Maximum Ratings
Plate Voltage30000 V
Plate Dissipation60 W
Cathode Current150 mA
Audio Performance
Key Features
- Thoriated tungsten filament
- Centre-tapped filament
- Directly equivalent to U.S.A. 705A
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Bi-phase half wave (2 valves) | 9000 V | — | — | — | 200 mA |
| Full wave (4 valves) | 18000 V | — | — | — | 200 mA |
Application Notes
For use in ideal choke-input filter circuits. Ratings vary based on Peak Inverse Voltage (PIV).
Datasheets
Datasheet: 705A.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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