M'ont permis de redonner vie à un préampli pour basse Peavey du début des années 90, avec à la clef une excellente réserve de gain, un son transparent et profond, et un overdrive doux et très musical.
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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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