RES 664D
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BrandTelefunken
ClassPower Pentode
Construction
Primary TypeIndirectly Heated
EnvelopeGlass, Top Cap
Sections1
Filament / Heater
Absolute Maximum Ratings
Plate Voltage400 V
Plate Dissipation12 W
Grid 2 Voltage200 V
Audio Performance
Key Features
- Schutzgitter-Kraftverstärker-Röhre
- Top cap anode connection
- Higher efficiency than RE 604
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A | 400V | 3500 | - | 80 | - |
| Class A | 400V | 3500 | - | 80 | - |
Application Notes
The anode is brought out at the top due to high instantaneous anode voltages. The anode plug is connected to a side terminal of the base.
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