The BHK Signature preamplifier ($5999 in black or silver) marks a surprising turn for PS Audio: It has tubes. That’s surprising because CEO Paul McGowan has long been anti-tube. “It’s not that I do not like the sound of tubes, I always have,” he recently wrote on the company’s website. “I just never felt their frailties were worth their sonic virtues, and I was convinced we could do as well without them.”
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https://www.stereophile.com/content/ps-audio-bhk-signature-preamplifier