Rocky Mountain Audio Fest 2015 Hot Product
Following hard on the heels of the well-received BHK Signature 300 amplifiers, PS Audio were showing a prototype of the upcoming partnering preamp (top unit only). Housed in PS Audios now-familiar curved aluminum casework, this is a fully balanced hybrid design employing a pair of 12AU7 tubes to feed a MOSFET output stage, the line stage offering five inputs (single ended or balanced) and an internal headphone amplifier. But the real news is the two-stage volume control that combines a classic variable shunt attenuator with a second stage that actually varies the gain of the vacuum tubes.
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