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Tube-number record
8417
5 archive entries
BrandSYLVANIA
Classbeam-power pentode
BaseOctal
Filament6.3 V @ 1600 mA
Construction
Primary TypePentode
EnvelopeT-12
Sectionssingle
Filament / Heater
Heater NotesCoated Unipotential
Absolute Maximum Ratings
Plate Voltage660 V
Plate Dissipation35 W
Grid 2 Voltage500 V
Cathode Current200 mA
H-C Voltage200 V
Audio Performance
Typical THD2.5%
Power Output100 W
Key Features
- Beam-power pentode
- High power high-fidelity audio equipment
- Regulator tube
- 100 Watts output in push-pull
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Average Characteristics | 300 V | 23000 | 16000 | 16.5 | 100 mA |
| Class AB1 Ultra-Linear Push-Pull | 445 V | — | — | — | 146 mA |
| Class AB1 Pentode Connected (A) | 400 V | — | — | — | 150 mA |
| Class AB1 Pentode Connected (B) | 560 V | — | — | — | 124 mA |
Application Notes
It is essential to maintain free circulation of air around the tube for proper cooling. Screen tapped at 40% of primary turns for ultra-linear operation.
Datasheets
Datasheet: 8417.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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8417
- Brand
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