Pass Laboratories

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13395 New Airport Rd
Auburn, CA 95602
+1 (530) 878-5350
https://www.passlabs.com
Pass Laboratories, Inc was founded in 1991 by Nelson Pass. Operating out of his shop at home, Pass developed prototypes of a single-ended Class A amplifier design. At the same time, he and Mike Burley were constructing an in-house machine shop with three home-built CNC milling machines with which to produce the amplifiers when the design was finished. The first product, the Aleph 0, shipped in 1992. It was a mono-block design rated at 70 watts into 8 ohms, and was unique in using three gain stages of power Mosfets including a push-pull output stage biased by a big constant current source. The amplifier operated as single-ended Class A up to its 70 watt rating and in push pull Class A at higher wattage. The amplifier was highly acclaimed, and was called the Amplifier of the Decade in Stereophile magazine.

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