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Tube-number record
12DF7
4 archive entries
BrandTung-Sol
ClassTwin Triode
BaseNoval (B9A)
Filament12.6 V @ 0.15 mA
Construction
Primary TypeDual 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 | 100 V | 1250 | 70000 | 100 | 0.5 mA |
| Class A Amplifier - Condition 2 | 250 V | 1600 | 55000 | 100 | 1.2 mA |
Application Notes
Designed for service as a low level input voltage amplifier for tape recorders and high quality audio preamplifiers.
Datasheets
Datasheet: 12DF7.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
