Passive preamp using transformer attenuator with 23 step, reduce -60db. Input impedance is 600ohm, output impedance is 10Kohm, step up ratio 1:4.
Attenuator by transformers is quite different with resistor, it does not have signal lost, help sound more musical. Special using Amorphous core.
Special order chassis with 10mm thick.
Specification:
Response frequency 20~20KHz (+-0db) 16~35KHz(-1db)
Total harmonic distortion 0.05% 1W
Weight : 6kg
Here is what is called Amorphous core
Amorphous metal is an alloy with a non crystalline structure produced by ultra-rapid quenching (about 1 million ℃ per second) of molten alloy. Because amorphous metal has no anisotropic properties, which originated from a crystalline structure, and there are no crystalline grain boundaries to prevent motion of magnetic domain walls, it shows excellent magnetic properties such as high permeability and low loss while having a high-saturation magnetic flux density. Amorphous metal materials for transformers, whose main ingredient is Fe (iron), are used in power line transformers and industrial transformers. Compared to conventional materials such as silicon steel, amorphous metal materials have a small no-load loss (iron loss), 1/5 that of silicon steel. Therefore, they make a major contribution to energy conservation. Hitachi Metals provides amorphous metal ribbon.
approximately the same core loss as Co-based amorphous metal.
3) Low magnetostriction.
Less affected by mechanical stress. Very low audio noise emission.
4) Excellent temperature characteristics and small aging effects.
Small permeability variation (less than ±10%) at a temperature range of -50°C~150°C. Unlike Co-based amorphous metals, aging effects are very small.
5) Excellent high frequency characteristics.
High permeability and low core loss over wide frequency range, which is equivalent to Co-based amorphous metal.
6) Flexibility to control magnetic properties “B-H curve shape” during annealing
Three types of B-H curve squareness, high, middle and low remanence ratio, corresponding to various applications.
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Attenuator by transformers is quite different with resistor, it does not have signal lost, help sound more musical. Special using Amorphous core.
Special order chassis with 10mm thick.
Specification:
Response frequency 20~20KHz (+-0db) 16~35KHz(-1db)
Total harmonic distortion 0.05% 1W
Weight : 6kg
Here is what is called Amorphous core
Amorphous metal is an alloy with a non crystalline structure produced by ultra-rapid quenching (about 1 million ℃ per second) of molten alloy. Because amorphous metal has no anisotropic properties, which originated from a crystalline structure, and there are no crystalline grain boundaries to prevent motion of magnetic domain walls, it shows excellent magnetic properties such as high permeability and low loss while having a high-saturation magnetic flux density. Amorphous metal materials for transformers, whose main ingredient is Fe (iron), are used in power line transformers and industrial transformers. Compared to conventional materials such as silicon steel, amorphous metal materials have a small no-load loss (iron loss), 1/5 that of silicon steel. Therefore, they make a major contribution to energy conservation. Hitachi Metals provides amorphous metal ribbon.
approximately the same core loss as Co-based amorphous metal.
3) Low magnetostriction.
Less affected by mechanical stress. Very low audio noise emission.
4) Excellent temperature characteristics and small aging effects.
Small permeability variation (less than ±10%) at a temperature range of -50°C~150°C. Unlike Co-based amorphous metals, aging effects are very small.
5) Excellent high frequency characteristics.
High permeability and low core loss over wide frequency range, which is equivalent to Co-based amorphous metal.
6) Flexibility to control magnetic properties “B-H curve shape” during annealing
Three types of B-H curve squareness, high, middle and low remanence ratio, corresponding to various applications.