Aaudio Imports Debuts VPS-100 Phono Stage Preamplifier 
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Written by Dick Ward   
Friday, 18 December 2009

The VPS-100 Valve Phono Stage is a preamplifier made by Greece based Ypsilon and brought to the US market by Aaudio Imports.  It’s not exactly an elegant looking device.  The aluminum chassis harkens back to desktop computers of old.  But as the adage goes, it’s what’s on the inside that counts.

Ypsilon’s VPS-100 has a few key features that make it quite an impressive unit.  To start with, a passive RIAA circuit with zero feedback.  Other preamps often use active RIAA equalization, but Ypsilon prefers passive due to a feedback loop in the active circuit that creates a ringing sound in certain notes.  This passive RIAA EQ was established by the recording industry to improve sound quality and playback time.

The LCR network of the VPS-100 uses a pair of gain stages and two T filters.  An air core inductor forms the 2123Hz pole and has virtually no stray capacitance, according to Aaudio.  The 50-500Hz pole is formed directly at the output of the second gain stage with a high signal level.  Both stages utilize Siemens C3g tubes.

Accuracy on the VPS-100 is key, and it features an RIAA accuracy of 20Hz-20kHz ±0.5dB.  It’s got an overall frequency response of 10Hz-40kHz, and an output impedance of 1200 Ohms. The VPS-100 is available now from authorized dealers at $26,000.

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