7561
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BrandTELEFUNKEN
ClassNF-Leistungspentode
BaseOctal
Filament6.3V @ 0.25mA
Construction
Primary Typepentode
Envelopeglass
Sections1
Filament / Heater
Absolute Maximum Ratings
Plate Voltage350 V
Plate Dissipation13 W
Grid 2 Voltage200 V
Grid 1 Voltage-100 V
Cathode Current150 mA
H-C Voltage200 V
Audio Performance
Typical THD10%
Power Output6.5 W
Key Features
- Reliability
- Long life
- Tight tolerances
- Cathode free from interface
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Eintakt-A-Betrieb | 250V | 10500 | 12400 | 77 | 42mA |
| Gegentakt-AB-Betrieb | 350V | 10500 | - | - | 27mA |
Application Notes
The factor P indicates how many of 1,000 tubes fail over an operating period of 1,000 hours.
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