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SOVTEK 12AX7WB / 7025 Twin Triode Tube (Unit)
This double triode tube with equipotential cathodes Sovtek 12AX7WB/7025 offers a higher gain and saturation than the model 12AX7WA. This model is known for its musicality and the roundness of its reproduction.
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Sovtek 12AX7WB / 7025
Twin Triode Tube
This twin triode tube with equipotential cathodes Sovtek 12AX7WB/7025 offers a higher gain and saturation than the model 12AX7WA. This model is known for its musicality and the roundness of its restitution. It is particularly designed to amplify low frequency voltages. It can replace a 12AX7/ECC83 tube or be used in a DIY integration.
Technical characteristics
| Specifications | |
|---|---|
| Product type | Tube |
| Tube type | Twin triode |
| Number of pins | 9 |
| Dimensions | Ø22.5 x 56.5mm |
| Electrical parameters | |||
|---|---|---|---|
| Parameter | Conditions | Min | Max |
| Heater current | Filament voltage : 6.3V | 300mA | 340mA |
| Filament voltage : 12.6V | 150mA | 170mA | |
| Grid reverse current | Filament voltage 6.3V ou 12.6V, plate voltage 250V, grid voltage minus 1.5V, grid circuit resistance 1MΩ | - | 0.2µA |
| Plate current | Filament voltage 6.3V ou 12.6V, plate voltage 250V, grid voltage minus 1.5V | 1.2mA | 3mA |
| First and second triodes plate current difference | Filament voltage 6.3V ou 12.6V, plate voltage 250V, grid voltage minus 1.5V | - | ±40% |
| Amplification factor | Filament voltage 6.3V ou 12.6V, plate voltage 250V, grid voltage minus 1.15V | 95 | 1125 |
| Limit values | |||
|---|---|---|---|
| Parameter | Conditions | Min | Max |
| Filament voltage | Parallel connection | 6V | 6.6V |
| Series connection | 12V | 13.2V | |
| Plate voltage | - | - | 300V |
| Cathode - Heater votlage | - | - | ±200V |
| Cathode current | - | - | 10mA |
| Power dissipation at the plate of each triode | - | - | 1W |
| Grid circuit resistance for each of the triodes | Fixed bias | - | 1MΩ |
| Self bias | - | 2.2MΩ | |
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