7581
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BrandTUNG-SOL
ClassBeam Power Pentode
Base6-pin Octal
Filament6.3V @ 900mA
Construction
Primary TypeBeam Power Pentode
EnvelopeGlass T-12
Base MaterialLow-loss material
Filament / Heater
Heater NotesCoated Unipotential Cathode
Absolute Maximum Ratings
Plate Voltage500 V
Plate Dissipation20 W
Grid 2 Voltage450 V
H-C Voltage200 V
Audio Performance
Typical THD5%
Power Output1.4 W
Key Features
- Direct replacement for 6L6GC
- Controlled zero-bias characteristics
- Low-loss base
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Pentode Connection | 250V | 6000 | 22500 | - | 72mA |
| Class A1 Amplifier - Triode Connection | 250V | 4700 | 1700 | 8 | 40mA |
| Class A1 Amplifier - Pentode Connection | 300V | 5300 | 35000 | - | 48mA |
| Class A1 Amplifier - Pentode Connection | 350V | 5200 | 34000 | - | 54mA |
Application Notes
The 7581 is a beam-power pentode primarily designed for use in audio-frequency power-amplifier applications. It features additional controlled zero-bias characteristics and a low-loss base.
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