Fet Valve Ultra Power Amplifiers (Our Very Best)

The Fet Valve Ultra amplifiers are our newest and purest musical performers yet. Building upon our famous EXR series amplifiers, we have distilled the design to remove the last bit of electronics from the music and present you with absolutely grain free, glare free, emotionally rewarding performances.

The audio circuits have had major improvements, as have the power supplies. The regulated supply voltages to the tubes has been improved and increased to mimic the performance of our Ultra preamplifier designs. The design efforts were hard, but the results are worth it.

The Fet Valve amplifiers are clear, pure, transparent, with even wider musical range and dynamics than the OmegaStar series, with the addition of the ability to capture the spirit and emotions of the music like nothing else, and weed out the nasties at the same time. It appears that there really is something that a vacuum tube can do, when used properly, that makes all the work worthwhile.

For anyone loving real acoustic live music, our just-upgraded hybrid vacuum tube designs are the best possible choice. They can only be compared with live, and unless the live is very good (and performed without electronic sound reinforcement) our patented Fet Valve designs will actually give you better sound at home than you hear at the performance.

The Fet Valve amplifiers are our highest expression of hybrid design, blending the best of vacuum tube and solid-state technologies. All of the basic design concepts are uniquely ours with sixteen allowed patent claims. We design and build these lush, wonderfully transparent, and outrageously dynamic amplifiers to satisfy those who have never been satisfied with solid-state alone. The sound stage is life-sized and the performers are real.

Our hybrid vacuum tube design sounds so real because it lets the individual gain parts each work in optimum environments. Vacuum tubes are great at manipulating voltages-you can play with 200+ volt signals where transistors would go up in smoke and flames. So, we use vacuum tubes for all voltage manipulations. Vacuum tubes, however, cannot drive difficult loads. They have very limited output current and get in big trouble trying to drive feedback loops, stray internal capacitances, and connection cables. So, we don't let our tubes see any loads at all. They operate in an idealized mode amplifying voltages only, and do it perfectly.

Power MOSFETs are super current amplifiers. They can control great gobs of current without stress, and when properly selected and used, they perform without needing external compensation, thermal tracking circuits, or VI limiting and protect circuits. So we use all power MOSFETs for current-amplification duties. There is simply no roughness or compression in Fet Valve amplifiers.

Our power supply features a shielded toroid power transformer and regulated 12 volt heater supplies for the vacuum tubes. The tubes see no AC ripple at all and thus have vastly extended service lives. There is a separate six-stage power supply for the active circuits with isolated regulated high speed analog active supply sections for each tube and hybrid section of each channel.
Unlike other tube-MOSFET hybrids, our tube sections do not have to directly drive MOSFETs connected to real world loads, thus the tubes never load down as they are doubly isolated from the real world. The promise of true hybrid design is realized in your music system, not just on paper.

We have two stunning amplifiers for those demanding musical reproduction that is not reproduction at all, but is best described as a ticket to the performance. You are going to want to dress up and be handed the program before touching the power switch (it really raises the curtains) and then watch the concertmaster rise and the conductor stride in. Close your eyes and you are there.