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Tubes Triodes (Matched Pair)
The Tung-Sol 12AX7 are high-gain dual triode tubes of superior quality with ultra-low microphonic effects and ensuring a wide soundstage and warm, musical sound reproduction. They are also an excellent replacement for the 7025 t ECC83 tubes. These 12AX7 tubes come in pairs and are matched to ensure the best performance.
| # Pin | Electrode name |
| 1 | Second triode plate |
| 2 | Second triode grid |
| 3 | Second triode cathode |
| 4, 5, 9 | Heater |
| 6 | First triode plate |
| 7 | First triode grid |
| 8 | First triode cathode |
| Specifications | |
|---|---|
| Product type | Tubes |
| Tubes type | Triodes |
| Number of pins | 9 |
| Quantity | Matched pair |
| Measurements | |||
|---|---|---|---|
| Parameter | Conditions | Min. | Max. |
| Heater current | Filament voltage 6.3V | 320mA | 365mA |
| Heater current | Filament voltage 12.6V | 160mA | 183mA |
| Grid reverse current | Filament voltage 6.3V ou 12.6V, plate voltage 250V, grid voltage minus 2V, grid circuit resistance 1MΩ | - | 1.5µA |
| Plate current | Filament voltage 6.3V ou 12.6V, plate voltage 250V, grid voltage minus 2V | 0.75mA | 2.1mA |
| First and second triodes plate current difference | Filament voltage 6.3V ou 12.6V, plate voltage 250V, grid voltage minus 2V | - | ±40% |
| Amplification factor | Filament voltage 6.3V, plate voltage 250V, tension grille 1 minus 13.5V, tension grille 2 265V, plate circuit resistance 2kΩ | 8.5W | - |
| Cathode - Heater insulation resistance | Filament voltage 6.3V ou 12.6V, cathode heater voltage ±200V | 20MΩ | - |
| Limit values | ||
|---|---|---|
| Parameter | Min. | Max. |
| Filament voltage (parallel) | 6V | 6.6V |
| Filament voltage (series) | 12V | 13.2V |
| Plate voltage | - | 330V |
| Cathode - Heater voltage | - | ± 200 |
| Cathode current | - | 9mA |
| Power dissipation at the plate of each triode | - | 1.2W |
| Grid circuit resistance for each triode, fixed bias | - | 1MΩ |
| Grid circuit resistance for each triode, self bias | - | 2.2MΩ |
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Cedric J.
Cedric J.
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