Altraum Co., Ltd. of cypress is located in the city with prosperous culture, art, Hi-Tech then in HongKong. It is the speciality that is researched and developed, designed to the enterprises which makes the amplifier of power of audio frequency of electron tube of high-fidelity. By many persons of music fevered fan and a dozen producer making technological main force of experience for many years that retire our company, devoted to family electron tube work machines, car electron tube work putting machine, testing room design and audio amplifier related reseach, development, producing and sellings. Our company only side wind, make, offer most steady audio frequency output transformer, power transformer by oneself.