Tube-number record
12DM7
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BrandTung-Sol
ClassDuotriode
BaseNoval (B9A)
Filament12.6 V @ 0.13 mA
Construction
Primary TypeDuotriode
EnvelopeGlass
Base MaterialMiniature 9-Pin
Sections2
Filament / Heater
Heater NotesSeries or Parallel operation; AC or DC
Absolute Maximum Ratings
Plate Voltage340 V
Plate Dissipation1.1 W
Grid 1 Voltage-50 V
H-C Voltage180 V
Audio Performance
Key Features
- Low-hum
- High-mu
- 9-pin miniature construction
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Class A Amplifier | 100 V | 1250 | 80000 | 100 | 0.5 mA |
| Class A Amplifier | 250 V | 1600 | 62500 | 100 | 1.2 mA |
Application Notes
The 12DM7 is particularly adapted for application in low level stages of high-fidelity amplifiers and other audio equipment.
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