Musical Fidelity Nu-Vista 800 Integrated Stereo Amplifier Test

Musical Fidelity Nu-Vista 800 Integrated Stereo Amplifier Review

Musical Fidelity, founded by Anthony Michaelson, has been designing and manufacturing high-end audio and hi-fi equipment for over 30 years. Known for combining classic audio engineering with modern innovation, the brand has earned a strong reputation among audiophiles.

Now let’s take a closer look at the Nu-Vista 800 integrated amplifier.

The Nu-Vista 800, available in both black and silver finishes, is notably larger than most amplifiers and weighs a substantial 39 kg—clearly disqualifying it from the category of featherweight units. The front panel features two large dials for volume control and source selection, a liquid crystal display, and a power button. Thick, robust heat sinks on each side provide efficient cooling to ensure stable performance.

The power delivered per channel is 330 watts. The back of the amplifier has 4 pairs of RCAs, a pair of XLR inputs, and 2 pairs of RCA outputs. The latter can be used to change the signal level. Double cabling is also possible, the amplifier can also accept banana plugs. It is made of premium parts, it it is clearly visible at first sight.

Nuvistor technology

The Nu-Vista series is made using Nuvistor technology, developed in the 1950s. Nuvistor is an advanced metallic electron-tube that is extremely durable, provides high performance and excellent sound and flexibility. This state-of-the-art circuitry guarantees excellent, clear, distortion-free sound and stable operation.

Musical Fidelity’s founder, Anthony Michaelson, acquired the last operational Nuvistor production line and essentially established his own Nuvistor manufacturing facility. While the rise of transistors had once rendered vacuum tubes obsolete in the hi-fi industry, this unique technology has been revived with purpose. The manufacturer claims an impressive 100,000-hour lifespan for each Nuvistor.

Typically thimble-shaped and made entirely of metal with a ceramic base, Nuvistor vacuum tubes require specialized equipment and a dedicated production line. Each unit is assembled, enclosed in a metal casing, sealed, and then processed in a vacuum chamber using precision robotic tools. Nuvistors are known as some of the best-performing receiver tubes, offering extremely low noise levels and exceptional reliability.

The Nu-Vista 800 features a triode design, and thanks to its direct heating system, it remains safe and stable even at high operating temperatures. Through small openings on the top and rear panels, you can view the four glowing Nuvistor tubes. These light up red at startup, then shift to green once they reach optimal temperature.

The Nu-Vista 800 features a fully symmetrical design with two large transformers and two monoblock amplifiers—commonly referred to as a “dual mono” configuration. This architecture ensures excellent channel separation and decoupling. The amplifier delivers a frequency response from 10 Hz to 30 kHz, a signal-to-noise ratio of 107 dB, and includes two line-level outputs for analog recording and headphone connectivity.

Its remote control is heavy and solid, crafted from aluminum with a satin-gloss finish. The LED backlighting can be switched off if it’s distracting. The amplifier itself is enclosed in a thick, brushed aluminum casing, providing outstanding durability and stability.

Internally, a Surface Mount PCB layout enables short signal paths, minimizing distortion even further. A bypass mode is also available for integration into home theater systems. However, it’s worth noting that the unit lacks USB inputs, a feature now standard in most modern amplifiers.

The Nu-Vista 800 features a bridge-connected output stage, where two amplifiers per channel operate in opposite phase, delivering 2170 watts per side at 1 Ohm load. Each monoblock is powered by its own 1.5 kV ultra-low-noise mains transformer, ensuring precise control and exceptional dynamics.

The result is a powerhouse amplifier that combines massive current delivery with effortless finesse, offering fast, clean, and unconstrained performance.

We connected the amplifier with a pair of Dynaudio speakers in a home theatre room, where acoustic carpets, curtains and printed acoustic wall panels were used to achieve a relatively ideal sound. A few more diffuser elements would be needed to create the perfect acoustics.

We tested how well it performed in the amp music field. We were first listening to Bruno Mars – Anderson – Paak: Leave the door open. The Nu-Vista 800 provided clear, sharp and detailed sounds, wide basses, extended low frequencies and an excellent stereo effect. The amplifier sound was fine and soft.

Our movie experience was akin to that of music. We opted for the crime film drama 21 Bridges first released in 2019. We had a pleasant, detailed, spacious reproduction of sound, the delicacy sometimes went to the detriment of the middle range tones, which were a bit obfuscated for our taste. The bass sounds, on the other hand, were very intense, clear, and unambiguous.

Summary

The Nu-Vista 800 amplifier relies on a somewhat dated yet extremely reliable technology—Nuvistor tubes, known for their impressive lifespan of up to 100,000 hours. This ensures long-term, dependable operation from any amplifier that employs them.

Due to its considerable size and weight, careful planning is needed to find an appropriate place for installation. However, its rich, expansive soundstage and wide stereo imaging more than make up for the physical demands. That said, the midrange performance can occasionally be inconsistent, and the lack of a USB input is a notable omission in today’s feature-rich audio landscape.

The amplifier’s key strengths lie in its durability, high performance, and the warm, natural sound produced by its direct-heated vacuum tubes. The dual monoblock design ensures excellent channel separation, further enhancing the audio experience. It’s well-suited for both serious music listening and home cinema systems, thanks to the inclusion of a bypass mode that allows seamless integration into surround setups.