Tube-number record
6840
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BrandGeneral Electric
ClassTwin Triode
BaseNoval (B9A)
Filament6.3 V @ 800 mA
Construction
Primary TypeDual triode
EnvelopeT-6 1/2
Base MaterialGlass
Sections2
Filament / Heater
Heater NotesSeries or Parallel connection
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation4 W
Grid 1 Voltage-75 V
Cathode Current35 mA
H-C Voltage100 V
Audio Performance
Key Features
- Five-Star Tube
- High Perveance
- Medium-Mu
- Sharp-cutoff characteristic
- Shock and Vibration ratings
- Heater-cycling rating
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Typical Operation (Each Section) | 250 V | 6700 | 3000 | 20 | 14 mA |
Application Notes
The 6840 is primarily designed for service in computer applications, specifically frequency-divider service. It incorporates an extremely high zero-bias plate current and maintains emission after long periods of operation under cutoff conditions.
Datasheets
Datasheet: 6840.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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