Tube-number record
ECC82/12AU7
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BrandEi-RC
ClassA.F. Double Triode
BaseNoval (B9A)
Filament6.3 V @ 300 mA
Construction
Primary TypeTriode
EnvelopeGlass
SectionsDouble
Filament / Heater
Heater NotesIndirect heating by AC or DC; serial or parallel supply. Pin 9 is center tap.
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation2.75 W
Grid 1 Voltage-100 V
Cathode Current20 mA
H-C Voltage180 V
Audio Performance
Key Features
- Low microphony
- Indirectly heated
- Parallel or serial heater supply
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Typical Characteristics (Set 1) | 100 V | 3100 | 6250 | 19.5 | 11.8 mA |
| Typical Characteristics (Set 2) | 250 V | 2200 | 7700 | 17 | 10.5 mA |
Application Notes
Can be used without microphony precautions in equipment where input voltage is >= 10mV for 50mW output. Noise level better than 60dB below 100mV when center tap is grounded and Rg <= 0.3 Mohm.
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