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We can provide special order made ISO (TANGO) power transformer which use for 117V, 220V, 230V,240.You dont need to use step down transformer as using my amplifier

From now we can provide amplifier with wooden chassis based on order of customer. Please contact for more detail !!!

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Passive preamp 23 steps attenuator Amorphous core transformer * silver wire ONLY one !

This product is not for sale, if you want the same item, please contact me for special order making
Manufacturer:
OTOMON Lab

Audio amplifier » Tube amplifiers Audio amplifier » Special Order Made
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. Due to lack of silver wire, there is only one was made.

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.
Click to the image to view it in big size and please read our busines term before making your decision

More detail pictures:

Passive preamp 23 steps attenuator Amorphous core transformer * silver wire ONLY one !

Passive preamp 23 steps attenuator Amorphous core transformer * silver wire ONLY one !

Passive preamp 23 steps attenuator Amorphous core transformer * silver wire ONLY one !

Passive preamp 23 steps attenuator Amorphous core transformer * silver wire ONLY one !

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