The Nautilus allows for a wide range of tubes, including 6l6gc through KT90s. Volume control is handled via a 24step stepped attenuator. The increases in micro-detail retrieval were remarkable. The input of Nautilus unitizes input transformers for reduced noise floor, greater clarity, and sub-bass response.įor this reference amplifier, we paired the finest coupling caps, Jupiter copper foil in wax caps. The Nautilus performance is made possible with custom wound ultra-high quality output transformers from Transcendar, which provide excellent frequency extension and a flat response.Ĭinemag transformers are used as input transformers for XLR to RCA conversion. Transformers are one of the most special aspects of the amps. You can choose between headphones or speakers without wiring changes to your system. This simple addition was not without compromise. headphone output is selected with a small toggle switch on the back of the amp. We mean by this, the Nautilus allows for five separate impedances to be selected for system matching and has a pair of 8ohm 5 way binding posts. The Nautilus has been described as a tube integrated amp for personal audio users. We use multiple dedicated taps for headphones to offer a dedicated selection for the most comprehensive range of headphones. The Nautilus does not use a voltage divider network but depends on transformers instead. These amplifiers demand to be played and built to last a lifetime. Some of the most familiar tube amps ever produced utilize this method, including McIntosh, HK, Leek, Quad, & Western Electric. This is not due to intrinsic inferiority, but rather it is impossible to rush and is incredibly expensive to produce. The Nautilus is built in a way few modern amplifiers are. We consider this a standard-bearer of purest audio with an American sensibility. The Nautilus is a classic and decidedly prosaic design, as it employs turrets and point-to-point wiring & there is no silicone, ICs, or regulators. We additionally choose to cover all the transformers and business end of the amp with a gorgeous chrome cover. In total, the Nautilus is 55lbs before packing. We partnered with our existing CNC metal fab house to build a 12 gauge steel chassis with bracing that could support the 40lbs of transformers without a hint of strain. The Nautilus’ hand build nature and part selection necessitated a robust hand fabricated chassis. We were unconstrainted with parts selection and layout and chose the most robust power transformer and widest/least distortion output transformers we could find. The amps are built with separate turret boards, with the one shared component being the input tube, volume control, and outputs.
2 Power Transformers, Separate Power Supplies, Chokes, and input transformers. We start with our most versatile circuit, the Mogwai, and go about creating two separate amps that share a single chassis. The Nautilus brings the dual-mono layout onto a single chassis. The Sulo and Leeloo monos brought turret-based construction and our highest performance to personal audio, but the dual mono layout is not for everyone. Ampsandsound followed with the Sulo monos. From that seed came my own Cit II Monos build on turrets just like the best amps of the golden age. I choice the HK Cit II as my inspiration point. All too often, my own listening space was sacrificed for the need for demo stock.
These were to be mine without branding and never to leave for demos. We set out to build my private amps apart from ampsandsound. The Story of the Nautilus is born of the same process that brought the Zions. The Nautilus is our flagship Personal Audio Tubed Integrated Amplifier.
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