Tube-number record
6689
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BrandRogers Electronic Tubes
ClassPentode
BaseNoval (B9A)
Filament6.3 V @ 300 mA
Construction
Primary TypePentode
EnvelopeT6 1/2
Base MaterialGlass
SectionsSingle
Filament / Heater
Heater NotesParallel supply: max variations < 5%; Series supply: max variation < 1.5%
Absolute Maximum Ratings
Plate Voltage210 V
Plate Dissipation2.1 W
Grid 2 Voltage210 V
Cathode Current16 mA
H-C Voltage100 V
Audio Performance
Typical THD10%
Power Output0.66 W
Key Features
- Long life
- Low noise
- Internal shielding
- Designed for telephone equipment
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Typical Characteristics | 210 V | 9000 | 500000 | 34 | 10 mA |
| Class A Amplifier (Config 1) | 120 V | 8200 | 420000 | — | 8.3 mA |
| Class A Amplifier (Config 2) | 210 V | 8200 | 440000 | — | 8.3 mA |
Application Notes
Radiation capacitance measured in a box with inner diameter 2 1/16 inch and length 3 7/8 inch.
Datasheets
Datasheet: 6689.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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