It was a very strange encounter, and by chance I ended up selling Q-tron audio, a luxury Swedish amp brand. I'm embarrassed to say that this brand has been a OTL amplifier that does not use an output transformer, and I have been living without knowing it until I became an acquaintance.
but!
After doing some research, I was curious about the technological capabilities of Q-tron, which have been able to overcome all of the amazing and fine lines of this OTL (output transformerless) amplifier, and the technical capabilities of the Q-tron, which have been fully compiled and sublimated. If we were to compare it to a car, it would be Mazda, which has overcome the high performance and unproductivity of a rotary engine. . Come to think of it, Koenigsegg, a supercar manufacturer loved by VIPs around the world for its original design and top speed, is also Sweden. Q-tron also has the brilliant sound and design that breaks the preconceived notions of old audio journalists, which is what makes it so amazing in Scandinavian Sweden.
OTL amplifiers bring a new dimension to traditional tube amplifiers through their unique technology and design. In a typical vacuum tube amplifier, an output transformer is used to convert the speaker's low impedance to the appropriate load impedance, but the transformer constrains the sound quality and causes distortion and limits in frequency response. The OTL amplifier stands for "Output Transformer Less" and completely eliminates the output transformer and provides smooth and clear sound. This gives a sound that is much more transparent than traditional amplifiers.
Click here for Q-tron's OTL amplifier product page
https://exclusive-audio.jp/collections/qtron
Q-tron's OTL amplifiers have high resolutions, particularly for bass and high notes, and even reproduce the fine nuances of the music without any problems. It maintains the warmth of a single-ended vacuum tube amplifier (SET), while also providing a wide sound that makes listening less tiring. Additionally, the excellent transient response gives a richer representation of the dynamics of the music, allowing you to enjoy even clearer sound quality than traditional push-pull amplifiers.
Furthermore, Q-tron uses an improved Futterman circuit, which has a lower output impedance than the Circlotron circuit, allowing it to be compatible with 4Ω speakers. High power output is achieved with fewer vacuum tubes and prevent thermal runaways and deterioration of vacuum tubes, increasing reliability and stability. In terms of sound quality, the unique driver stage achieves distortion reduction of more than 10 times, and the 25W output model (PA12) achieves an astonishingly low distortion of less than 0.01% at 1W and less than 0.1% at 10W. What's more, this performance is achieved without excessive feedback.
It also boasts a noise level of less than 100dBA, the highest in the industry, and maintains high reliability even after long-term use. Using quality parts designed and manufactured in Sweden, Q-tron has never reported a failure even after more than seven years of production.
Q-tron Audio's OTL amplifier is the new standard for vacuum tube amplifiers that combine clear sound with clear sound, excellent durability and safety. Try out the highest quality sound experience.
Q-tron Audio's amplifiers are not only extremely important to their outstanding sound quality, but also to their preamps and safety.
First of all, Q-tron preamps are designed to bring out the best performance when combined with a power amplifier. It achieves extremely low noise levels and distortion, providing extremely clear and transparent sound quality as an overall amplifier. It also features high-precision volume control, allowing you to adjust the volume using 64 discrete resistors. This volume is switched by a relay and gold plating is used for the contacts, ensuring durability and signal purity.
Q-tron Audio also takes thorough consideration in terms of safety. Some OTL amplifiers have designs that are risky for speakers and listeners, but Q-tron amplifiers don't need to worry about that. Especially when using expensive speakers, you should avoid the risk of the speaker breaking down in the event of an accident. The Q-tron amplifiers include a protective circuit that instantly shuts down the amplifier in the event of a harmful DC voltage at the output, and also includes an ultra-fast fuse. This double protection mechanism allows you to enjoy high quality sound with confidence while protecting the speakers.
Q-tron Audio uses the improved Futterman circuit of two typical OTL circuits: the Futterman circuit and the Circlotron circuit. The Futterman circuit features a simple power supply design and low output impedance, and can also accommodate 4Ω speakers. Compared to Circlotron circuits, it can achieve high output with fewer vacuum tubes, and the output is connected to ground, providing reliable and stable performance. Meanwhile, the Circlotron circuit operates with a symmetrical design and is particularly good at sound balance, but is more complex than the Futterman circuit, requiring more vacuum tubes and special power supplies.
Q-tron's improved Futterman circuit reduces the output impedance even lower, achieving stable high output and clear sound quality with fewer vacuum tubes. This also improves the life and reliability of the vacuum tube. This improved Futterman circuit also completely eliminates the risk of electric shocks. For this reason, Q-tron's OTL amplifiers can also be used safely with headphones. Ensuring electrical safety when using headphones in particular was a difficult challenge with traditional OTL amplifiers, but the Q-tron design has overcome this problem.
Q-tron Audio not only provides the best sound of a vacuum tube amplifier, but also delivers a design that is second to none other in terms of reliability and safety. All components designed and manufactured in Sweden are of the highest quality, from one of the world's leading parts manufacturers, such as Nichicon, Kemet, Panasonic, KOA, Vishay Vithrom, and other products, ensuring consistent, high performance over the long term.
Q-tron Audio's OTL amplifiers are the ultimate amplifier, combining clear, high resolution sound, durable design and the highest level of safety. From preamplifiers to power amplifiers to speaker protection, please experience the design that does not compromise on any compromise.
Information on listening machine rentals (within Japan only)
Why not try the appeal of Q-tron Audio's OTL amplifiers in your own audio environment?
Our store offers a preview machine rental service for customers considering purchasing.
The rental period is one week and shipping costs will be charged only.
