8417
5 Tubes in archive
BrandSYLVANIA
Classbeam-power pentode
BaseShort Shell Octal 6-Pin
Filament6.3V @ 1600mA
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 | 300V | 23000 | 16000 | 16.5 | 100mA |
| Class AB1 Ultra-Linear Push-Pull | 445V | - | - | - | 146mA |
| Class AB1 Pentode Connected (A) | 400V | - | - | - | 150mA |
| Class AB1 Pentode Connected (B) | 560V | - | - | - | 124mA |
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.
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