Audio Note Oto Integrated Amplifier

About Audio Note Amplifier


Audio Note manufacture a complete range of valve amplifiers. Though their name may be synonymous with the likes of the Onkagu, they start from very reasonable prices. An Integrated OTO starts from £1,900, an M-Zero Pre-amp from £1,050 and a Vindicator Power- Amp from £2,400.
Audio Note is one company that has never needed to cloud its philosophy in marketing double-talk. Their premise has always been rather simple — directly heated triodes in single-ended mode with no global feedback. They feel, and much of the audio industry agrees, that transistor based amplifiers are fundamentally flawed because they are a semi-conductor yet live music is a linear sonic event.
Simplicity is at the heart of every Audio Note amplifier. They pay homage to the idea that every component exerts an influence on the sound, so they must each be of the very best possible quality. It is a powerful concept achieved through visionary engineering, extensive research and development.
Refinement is the central theme to every Audio Note Amplifier. They do not believe in applying bigger, louder or more complex solutions to their products. Instead they seek to establish greater value through better sound. They look for solutions in technology, techniques, parts, materials and amplifying devices that can be shown to provide better low level behaviour, as they believe these are the most important aspects.

About Audio Note Oto SE Integrated Amplifier

The OTO is a modern day classic amplifier. It was launched back in 1992, and it continues to beguile, amaze, and sneak into the hearts of owners for its sheer beauty at replaying recorded material.
There are three different versions of the OTO available. All three versions are available with or without phono stage. It comes with either a silver aluminium or black acrylic fascia. Simplicity remains throughout the functionality of the OTO. It comes with five knobs on the front for Input Selection (Phono, CD, Aux, Tuner, Tape Selector) Balance, Volume and Power.
Audio Note OTO PP (Push Pull) integrated amplifier.
Audio Note OTO SE (Single Ended) integrated amplifier.
Audio Note OTO SE Signature integrated amplifier.
OTO PP (Push-Pull)  Class A, push-pull, EL84 based, 12 watt pentode amplifier. Available with or without phono stage. It is an excellent entry point to begin one’s journey into the world of Audio Note.
OTO SE. Single-ended, EL 84 based, 10 watt integrated amp. Available with or without phono stage. The best amplifier value in the Audio Note line. Likely designed with the Audio Note K’s in mind, it also makes a wonderful match with the 93dB J’s. The OTO is satisfyingly full, dynamic, and clear, sounding and wonderfully informative through the midrange
OTO SE Signature. Single-ended, EL84 based, 10 watt integrated amp. Available with or without phono stage. The wonderful Signature version of the classic OTO SE. The OTO SE Signature is both more robust and smoother sounding than the standard OTO SE. A fully worthy alternative to a Meishu for those who want the more direct, less atmospheric sound of EL84 tubes. The Signature version has higher quality parts including resistors, capacitors and wiring.

Audio Note Oto Reviews


“In the sea of budget tube amplifier makers, I think that, perhaps, Audio Note UK may go unnoticed. With stupefying price points in the Audio Note range of amplifiers heading up and over the $50,000 mark, it is perhaps forgotten that Audio Note also makes affordable products and quite excellent, affordable amplifiers; amplifiers like the OTO, for example. I like this amp because it is affordable even on a student’s budget, well, if you’re willing to go through your university years without a car, which is what I did. Ah the sacrifices we make for “good sound”, which is apparently what the word OTO means translated from Japanese.

The Audio Note OTO Phono SE is Audio Note’s entry level single-ended amplifier running in single-ended pentode mode. While Audio Note is famous for those ultra expensive Ongaku’s, it may be the OTO that most consumers will be introduced to first. The OTO is, if not already, a modern day classic amplifier. To be viewed a classic in virtually any arena, a pre-requisite is for it to be able to stand the test of time. Can your product still hold up against newcomers with new designs and ideas? The OTO SE has been selling for 16 years since 1992, and it continues to beguile, amaze, and sneak into the hearts of owners for its sheer beauty at replaying recorded material.

For the beginner, the OTO is about as easy as you could hope for in operation. First of all, there is no biasing to worry about and thus no need for volt meters. It’s as plug-and-play as it gets for tube amplifiers. With five gold knobs on the front for INPUT SELECTION (Phono, CD, Aux, Tuner), TAPE SELECTOR, BALANCE, VOLUME, and POWER, it’s as straight forward as it gets. The OTO Phono SE has 9 tubes, all of which can presently be purchased for as little as $6 – $10 each from various online retailers. Audio Note expects tubes to last for around 8,000 hours. This is an important aspect to consider for long term ownership because many other tube amps use tubes that don’t last nearly this long and are very costly to replace.

With the SET myths continually being espoused on forums, it is first-hand experience that is needed to get a true sense of what is going on. Firing up the OTO with its paltry 10 watts of EL 84 power, a tube considered in tube lore to be a weakling power tube, I was shocked by how truly powerful this amp can sound: full range, crystal clear to a high levels, and absolutely no noises, hums, or hisses. Basically, the experience had me doubting everything I had read for years on audio forums and in magazines. I didn’t get it.

To OTO or not to OTO?

That is the question. And the question that follows is not whether this ten-watt amp will work well with your speakers, but whether your speakers will work with this amp. With the Audio Note J or E loudspeakers, there is clearly a synergistic system match where the cohesion and timing and body of tone is so right that sometimes I wonder if one could want for more. The OTO with the J or E from the Rock oomph of AC/DC and Aerosmith to Sarah Mclachlan, Hayley Westenra, or Loreena McKennitt’s glorious sensual vocals to Beethoven’s full on 9th, the OTO is able to provide a powerful level of drive when needed, while also delicately delineating the subtleties of acoustic instruments and vocals.

The OTO is a nimbly tuneful amp ready to take what you throw at it in stride without a hint of gassing out. Strings and acoustic instruments have a rich decay, gentle, and insightful. Put on some electronic music and the amp is capable of digging down deep and grabbing you by the scruff of your neck. You wonder about bass and treble because such amps have always been said not to be able to cope with frequency extremes. Well, there is absolutely nothing to fear here and it’s truly a disservice that this myth gets propagated. I have owned and auditioned several respected solid-state amps that sounded leaner and lighter weight in the bass and offered none of the three-dimensional organic qualities offered up here. Indeed, I am hard pressed to think of a solid-state amplifier for the price, or maybe any price, that I would take over the OTO for pure music reproduction.

You Don’t Need to Win the Lotto to Own an OTO

Audio Note has some stupefying prices on some of their upscale equipment, so it’s nice to see that they don’t forget the audiophile on a budget. The OTO is by no means an inexpensive amplifier for most of us, but it is in the reach of most audiophiles looking to get a real taste of the organic musicality that the single-ended experience offers. A glorious combination of leading edge attack and full-bodied decay with astonishing bass depth and a grain-free open treble reproduction is what you get in the Audio Note world and the OTO doesn’t leave you out in the cold. The OTO has a beauty of tone, timbre, and a full-bodied enveloping sound that makes it difficult to resist on any music program.

The word “right” comes up in reviews again and again describing Audio Note products, and the OTO is no different. Of course, you will get better sound moving up the ladder or “levels” in the Audio Note line but that is how it should be. The question is can this be your last amplifier if you just want to be wrapped up in the music – with the right speakers; the answer is yes.

Chameleon-like is the order of the day here. The price of entry into the Audio Note single-ended world, and for the rewards you will get from this amp, it is nothing short of a steal. Audio Note is a company dedicated to music reproduction and while the OTO may not look like much against some of the ritzy glitzy competition, the music reproduction here should not be overlooked. This is a first-rate, well-built, classy-sounding amplifier.”- DAGOGO. RICHARD AUSTEN.

To read the full review of the Audio Note OTO SE in Dagago by Richard Euston click here

To arrange a demonstration of the Audio Note Oto Integrated Amplifier shown here, or any of our other products, please click here to open the demo booking form

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