Fonolab QVATTVOR Classic Full-Differential MC Step-Up Transformer

QVATTVOR Classic is a reference-class step-up transformer designed to maximize the potential of low-output MC cartridges. Instead of merely matching connection terminal standards, it adopts a "fully differential architecture" that defines the physical behavior of the signal itself. Its design, which allows no structural interference, brings unprecedented "structural precision" to analog playback.

A "different world" recognized only for QVATTVOR by audiophiles worldwide

• "The mist of the space clears, and the stage appears right before your eyes" An astonishing channel separation of over 80dB (20Hz–50kHz) delivers a realistic and tangible soundstage. Its overwhelming spatial control, described as "eliminating the ambiguity of mixed left and right sounds and fixing instrument positions to millimeter precision," is a result of the dual-mono magnetic structure.

• "Articulation of minute signals (clarity)" Users report, "I can now sense a solid core even in previously inaudible, fading pianissimo passages." By maintaining signal symmetry, it accurately captures fine details often buried in noise, bringing deep shading and drama to music.

• "The musicality of Tamura-made Super Permalloy" Pairs of closely matched Tamura-made transformers are used. Praised for both reliability and musicality, it has been described as "a treasure of domestic transformers that, while modern and high-resolution, draws the backbone of music robustly and reliably."

Innovation brought by fully differential (full-differential) design

The core of QVATTVOR, the "fully differential architecture," is not merely a difference in connection style. It is the physical optimal solution to completely protect weak MC signals from external noise and distortion.

1. Why 'fully differential'? — Self-cancellation of noise

In a fully differential system, signals are treated as pairs of "positive (+)" and "negative (−)" phases and transmitted completely isolated from the ground.

• Technical Benefits: External noise introduced into the circuit cancels out when the positive and negative signals are combined at the output, allowing only the music signal to be purely extracted.

• Listening Effects: Overwhelming reduction of the noise floor. From the pitch-black silence, subtle reverberations that were previously inaudible emerge.

2. Uncompromising Architecture: Pursuit of Signal Integrity

• Floating Differential RCA Input Even with RCA inputs, signals are instantly disconnected from the ground and immediately converted to differential internally. Consistent symmetry is maintained from input to output, thoroughly eliminating noise intrusion even when using unbalanced connections.

• Newly Designed FUCHS Universal Chassis Achieves compactness and lightweight design while improving shielding and damping characteristics. Equipped with abundant XLR/RCA-compatible inputs and outputs and flexible grounding options to minimize hum noise, ensuring seamless integration into any high-end system.