Tube-number record
678
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BrandWestinghouse Electric Corp.
ClassGrid-Controlled Mercury Vapor Rectifier
BaseSpecial / none
Construction
Primary TypeTriode
Rectifier TypeMercury Vapor
EnvelopeGlass
SectionsSingle
Filament / Heater
MaterialMercury Vapor
Warm-up Time60s
Absolute Maximum Ratings
Plate Voltage15000 V
Grid 1 Voltage-900 V
Cathode Current1600 mA
Audio Performance
Key Features
- Air-Cooled
- Grid-Controlled
- Mercury Vapor
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| 10,000 Volt Operation | 10000 V | — | — | — | — |
| 15,000 Volt Operation | 15000 V | — | — | — | — |
Application Notes
The minimum heating time refers only to the filament. Sufficient additional time must be allowed, during cold weather periods, to permit the condensed mercury temperature to rise to the minimum condensed mercury temperature limit. Typical bias value valid when using a 100,000-ohm resistor and a 0.01 microfarad grid to cathode by-pass condenser.
Datasheets
Datasheet: 678.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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