With the inclusion the new tube cage, the transformer cover was raised 2" to allow the cage to fully protect any KT-120/KT-150 tube. The resulting metal work and power supply changes have yielded our quietest Nautilus yet. Many still love the sleek lower profile look of the Classic Nautilus and as such we allow you to order your Nautiluswith the original metal work style or the Rev 2. The Classic Nautilus will additionally save you $1000 on the purchase.

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The Story of the Nautilus is born of the same process that brought the Zions. We set out to build my private amps apart from ampsandsound. These were to be mine without branding and never to leave for demos. All too often, my own listening space was sacrificed for the need for demo stock. I chose the HK Cit II as my inspiration point. From that seed came my own Cit II Monos build on turrets just like the best amps of the golden age.

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The Nautilus brings the dual-mono layout onto a single chassis. We started with our most versatile circuit, the Mogwai, and went about creating two separate amps that share a single chassis. 2 Power Transformers, Separate Power Supplies, Chokes, and input transformers. The amps are built with separate turret boards, with the shared component being the input tube, volume control, and outputs.

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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 consider this a standard-bearer of purest audio with an American sensibility. The Nautilus is built in a way few modern amplifiers are. This is not due to intrinsic inferiority, but rather it is impossible to rush and is incredibly expensive to produce.

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The Nautilus has been described as a tube integrated amp for personal audio users. 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 speaker vs. headphone output is selected with a small toggle switch on the back of the amp.

Red October Rev 2 includes 2023 tube cage. This change to the metal work allows us to delineate inclusion of the Gen 5 power supply and culmination of 2 years successive efforts to improve this amazing amplifier. With the inclusion the new tube cage, the transformer cover was raised 2" to allow the cage to fully protect any 300b. The resulting metal work and power supply changes have yielded our quietest Red October yet.

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Like the Nautilus, the Red October started as a personal project. It was not confined to a price point, and was not built for the masses, but instead the Red October was built to be the very best amplifier we were capable of building. We took every lesson we learned from the Nautilus, and we applied those lessons to the most legendary tube in the audio world, the 300B. People love the 300B for its true to life vocal representation and it's sense of clarity and space, it is the ultimate Directly Heated Triode.

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The Red October incorporates this famous tube in a circuit that traces its roots back to the Agartha. However instead of a circuit board implementation, the Red October is entirely hand assembled using point to point wiring and turret board constriction. Every component is hand selected and chosen for performance: Jupiter foil wax coupling capacitors and an excellent 24 step stepped attenuator are standard, the Red October has no compromises. Our skilled team assembles each unit entirely by hand. There is not a single IC, voltage regulator, or silicon chip in the Red October, this amplifier is built in accordance to classic techniques and will last a lifetime because of it.

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Our goal with the Red October was to honor the 300B, to do so we did a classic implementation with a single gain stage, zero feedback, and close attention to grounding techniques. The result is a deeper connection with your music, and an inky black background on headphones with no hum noise. The font end of the Red October uses a 12AX7 as an input tube. We chose this 9 pin high gain front end due to its ability to deliver a faster and more lively presentation. It also helps that 12AX7s are accessible in both old and new stock form. The front end of this amp is paired with a massive tube rectified dual mono power supply that ensures tight bass and earth shattering slam on any headphone you plug into this amplifier.

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While the Red October may look like a single amplifier, it is actually true dual mono amplifier built on top of a single chassis. The only shared components are the input tube, volume control, and output jacks. The power supply, power transformers, output transformers, and even the turret boards are all separate. The result is class leading mono block performance with the convenience and ease of a single chassis.

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When people talk about ampsandsound products, they often talk about our transformers. The Red October uses the best transformers we have ever developed. The power transformers are massively over spec'd and the output transformers have an incredibly wide bandwidth and provide the Red October with shockingly low distortion measurements given its single ended nature. Like the transformers we have taken great pride in our metal work. The Chassis is hand fabricated and built with 10 gauge steel. The result is a 68 pound amplifier that feels solid as a rock. To give the Red October a clean look, we covered the transformers and power supply with a gorgeous damped cover.

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While many things set the Red October apart from its peers, its most unique feature is the different output impedances, 5 in total. Unlike others who use voltage divider networks to create these different impedances, our transformers are wound with taps for each impedance. The result is the ability to perfect match the Red October with nearly every single production pair headphones in existence (as well as speakers). This also gives the Red October five distinct sonic profiles for every headphone allowing the listener to choose what sounds best to them.

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We call the Red October a tube integrated amplifier for personal audio use because it also contains a speaker switch and a pair of 8ohm binding posts on the back. With 8 watts of power, the Red October can easily power a reasonably efficient pair of speaker to deafening levels. The speaker selection switch allows you to select between the headphone outputs and the speaker outputs enabling the Red October to truly be the center of your audio system.

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When it comes time to connect your components to the Red October, you have two choices, a pair of high quality single ended RCA inputs, and a pair of XLR inputs. The XLR inputs us a input transformer to convert the incoming balanced signal to a single ended signal for the amplifier. The input transformer allows you to retain all the benefits of balanced cabling along with providing better bass and a quieter background.

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The Red October is everything we could have hoped it to be. It is truly a marvel to behold, and we are proud to call it our new flagship amplifier.

Our customers have come to love the laboratory grade implementation of our work and its intended long lifecycle. The Bounty is built with 11gage steel plate providing a compact and extraordinarily solid amp. The Bounty is meant to bridge the gap between headphones needing big power and a no compromise stereo amp for speakers of almost any pairing. With its 17watts you can run nearly any speaker practically in most rooms. Fantastic pairings include JBL L100, KEF LS50, Tekton double impacts, Zu Dirty Weekend, Klipsch Heresy/Cornwall and Fortes, LS3/5a, Harbeth 30.1s.

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The Bounty is an EL84 ultra linear amp with 17 watts of tube bliss. 2 EL84 tubes in push-pull configuration per channel with 12AX7 for input and a 12AU7 for the phase splitter. The circuit used is widely famed for its stability and liquid midrange. With fixed bias, tube rolling is a breeze. The removable tube cage protects your tubes when family and pets cant be trusted.

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The Bounty is based on the famous Halfer circuit with cathode bias allowing trouble free operation. 8ohm tap for speakers with a switch for deactivation. 16ohm, 32ohm and 100ohm 4pin XLR on the front providing a multitude of options for optimal impedance matching. The Bounty produces a stable 17 watts RMS with 22watt peaks with significant current delivery. The output transformers utilize massive cores which resist saturation and deliver jaw dropping low end performance thanks to their 35watt cores.

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Like all ampsandsound amplifiers, it is dead quiet with reliable performance. When we say dead… we mean put your ear to the mouth of your horn-loaded system and all you will hear is silence! Never leaving well enough alone, the Bounty is for those who demand the very last degree of performance. We employ use of custom wound transformers made exclusively for ampsandsound. The power transformer is nearly twice, and size and weight/core as needed in the unit to allow for real dynamic swings and true 200% duty cycles.

Double the Performance Trouble-free, noise-free, and double the power of traditional 300B amps. Made possible by patented circuit design. A New Classic We’re proud to continue a legacy of quality, American manufacturing with innovative new features. Ships with Tubes The 91E ships with new production 300Bs, the most popular electron tubes in the world. Made in the USA.