PST 100 MKII

About the PST 100 MKII

The PST 100 approaches preamplification in an outstanding way. Its heart is the in-house transformer used for attenuation, combined with a valve circuit and exquisite materials.

Conventional wisdom says the active circuit is the most critical part of a preamplifier. Ypsilon believes the means of attenuation, the volume control, matters most. After using the best resistor attenuators and being unsatisfied with the character they add, Ypsilon developed a transformer attenuator with special winding techniques and the finest wires and cores. With the very best core materials, its magnetic circuit is ultra-linear and sounds more musical and detailed than the best resistors. The PST 100 MKII uses 31 taps, for a total attenuation of 54 dB at the lowest tap.

The active gain stage is a no-feedback, single-ended C3m triode, transformer-coupled. The power supply uses a 6CA4 valve rectifier and choke filter, and wiring is point-to-point in pure silver. The attenuator sits after the valve stage, preserving the purity and micro detail of the signal.

The Anniversary version uses transformer attenuators with a custom nanocrystalline core.