The PST 100 approaches the concept of pre amplification in an outstanding way. Its heart lies in the in house made transformers used for attenuation. In addition its valve state circuit combined with exquisite materials produce the finest and most elegant sound that any pre amp could ever achieve.
Conventional wisdom suggests that the most critical part of a preamplifier is the active circuit design. We, however, believe that the means of signal attenuation (the volume control) is the most critical to the overall sound of a preamplifier. Most designers use resistor attenuators for volume control. Ypsilon have used resistor attenuators with high quality resistors (Vishay, in the past, felt unsatisfied from the character they induced in the signal. They developed a very special transformer as the means of attenuation, using special winding techniques and highest quality wires and cores. Its performance suppassed that of the best resistor attenuators. In a transformer the magnetic circuit can be ultra linear when the very best core materials are used. The sound of such materials is much more musical and detailed compared with the best resistors. A transformer attenuator with 31 taps is used in the PST100 mk2 providing a total attenuation of 54db in its lowest tap.