12DF7
4 Tubes in archive
BrandTung-Sol
ClassTwin Triode
BaseSmall Button 9 Pin Base
Filament12.6V @ 0.15mA
Construction
Primary TypeTwin Triode
EnvelopeGlass Bulb
Sections2
Filament / Heater
Heater NotesSeries or Parallel operation
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation1 W
Grid 1 Voltage-60 V
H-C Voltage180 V
Audio Performance
Typical THD5%
Key Features
- Low microphonics
- Low level input voltage amplifier
- Coated Unipotential Cathode
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A Amplifier - Condition 1 | 100V | 1250 | 70000 | 100 | 0.5mA |
| Class A Amplifier - Condition 2 | 250V | 1600 | 55000 | 100 | 1.2mA |
Application Notes
Designed for service as a low level input voltage amplifier for tape recorders and high quality audio preamplifiers.
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