Tube-number record
RES 1664
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BrandTelefunken
ClassPower Pentode
Construction
Primary TypePentode
EnvelopeGlass
Sections1
Filament / Heater
MaterialDirectly Heated
Warm-up Time20s
Absolute Maximum Ratings
Plate Voltage425 V
Plate Dissipation12.4 W
Grid 2 Voltage425 V
Audio Performance
Power Output10 W
Key Features
- High power output
- Quick warmup time
- Pentode structure
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Anodenruhestrom | 250 V | — | — | — | 100 mA |
| Normaler Arbeitspunkt | 250 V | 2300 | — | — | 45 mA |
| Schwingbetrieb | 425 V | — | — | — | 60 mA |
Application Notes
Commonly used in oscillator circuits (Schwingbetrieb) and power amplification stages.
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