TKDD1
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BrandTungsram
ClassBattery Double Triode
Construction
Primary TypeDouble Triode
EnvelopeMax diameter 45 mm, total length 95 mm
Sections2
Filament / Heater
MaterialDirectly heated
Absolute Maximum Ratings
Plate Voltage150 V
Grid 1 Voltage20 V
Cathode Current40 mA
Audio Performance
Typical THD8.5%
Power Output1.7 W
Key Features
- Klasse B-Schaltung
- Batterie Doppel-Triode
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class B (90V Operation) | 90V | - | - | - | 0.8mA |
| Class B (135V Operation) | 135V | - | - | - | 1.5mA |
Application Notes
Die Mittelanzapfung des Drivertransformators liegt am negativen Pol der Heizbatterie. Wird sie zum positiven Pol geschaltet, so steigt der Anodenstromverbrauch im Ruhezustand, die Wiedergabe aber wird verbessert.
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