Cypher Labs Prautes Headphone and Integrated Vacuum Tube Amplifier

Cypher Labs

The PRAUTES, and other products, are produced in a collaboration between Coffman Labs and Cypher Labs, bringing together two firms with advanced technology expertise. The goal: unlock an unsurpassed listening experience for the audio customer.

  • The PRAUTES is primarily a headphone amplifier, although it can also power small speakers and provides a line-out stage. The controls are optimized for headphone output and the result is an unbelievable clarity, presence and expansive soundstage. The PRAUTES drives a wide range of headphone types and provides for impedance matching. A very subtle bass boost feature is included.

    PRAUTES defined: understood to be a reference to proper understanding and accurate action. PRAUTES AS DEFINED BY THE ANCIENT GREEKS expresses a character in which strength and gentleness are perfectly combined. The PRAUTES amplifier seeks to do just that—present music in a manner that delivers subtlety, image, detail, and excitement, all in an accurate manner that duplicates the live experience. The Prautes amplifier combines vintage tubes, military technology, and hand made USA components to create the ‘PRAUTES’ experience. The result is a legacy piece—one that is timeless and enduring. 

  • The PRAUTES uses a 12AU7 tube gain stage to drive a pair of 50L6 tubes in push-pull mode. This provides for more power than needed for almost all headphones—and can drive high efficiency speakers with about 2 watts. Five separate output impedance settings are provided to match listening equipment, including 8 ohm speakers, standard headphones, high impedance headphones and In-Ear-Monitors.

    The PRAUTES amplifier bears the signature of Damon Coffman. He trained in college as a concert violinist, obtained his graduate degree in physics through the U.S. Naval Postgraduate School, then built his career as an engineer in medical technology firms. While pioneering new technologies for medical companies, Damon began searching for audio equipment that would give his favorite pieces of music the beauty of a live performance. He found some of what he was looking for in the designs of classic amplifiers from the golden age of analog audio. He then combined his passion for music, art, and craft into heirloom quality products that embody his design philosophy of simplicity, elegance, and accessibility.

    Line Stage: approximately 16dB
    Headphone power: > 1 Watt, depending on load

    Bass Boost:
    31, 36, 41, or 47Hz boost of approximately 3dB (6dBm)
    There are no extra active circuit elements are engaged!

    Ground Lift Switch:
    Use only if there is ground loop hum in your AC supply wiring.

    Tube Complement: 
    Four 50L6 tubes are supplied for the output stage
    Two 12AU7 tubes are supplied for the input/line stage

    Annodized tube shields are provided to cover the tubes. The use of the tube shields is optional.  

  • Frequency Response:  20Hz to 20KHz +.2dB to -.75dB into matched resistive load

    Note: Can vary slightly based on tubes installed

    Dimensions:  12 ½” D x 7 ¾” H x 9 ½” W / cm D x cm H x cm W

    Weight:  16 pounds / 7.3 kilograms (not including AC power cable)

    AC Power: 240V

    The PRAUTES is a tube-based analog amplifier. It is powered by a small, custom made, internal regulated semiconductor power supply— thus allowing single box construction.

    The PRAUTES is hand assembled entirely in the U.S.A at Coffman Labs with point to point wiring—it should last decades. All contact points are mechanical as well as electrical

    The PRAUTES is electrically rugged and meant to last

    The PRAUTES chassis is a 100% machined (not stamped metal) and able to take abuse. All chassis parts are interlocked in specially designed machined slots so that only four bolts per side are required to keep the structure intact