Fonolab QVATTVOR Pacto MC Step-Up Transformer

The QVATTVOR Pacto is a compact reference step-up transformer designed to directly integrate the "fully balanced circuit" of the QVATTVOR series high-end machines directly into standard unbalanced (RCA) systems. Simply connect your MC cartridge with a standard RCA phono cable, and internally, the signal is treated as a balanced waveform, allowing you to extract the benefits of symmetrical transmission identical to higher-end units with the shortest signal path without reconfiguring the system.

The true value of Quatvol for your RCA system

• "With just RCA, the interior is perfectly balanced." At the heart of Pacto is a fully balanced circuit designed identical to that of high-end models. The floating differential input instantly detaches signals incoming from RCA from the ground and internally converts them into symmetrical transmission. At the output stage, it returns to an unbalanced format, allowing you to enter the same world of symmetrical transmission as the top model without changing the existing phono equalizer or preamp configuration.

• "Articulation of Micro Signals (Clarity)" By maintaining signal symmetry internally, even pianissimos that are on the verge of disappearing, which tends to be buried by external noise, have a solid core resident. From the bottom of the pitch-black noise floor, I noticed the tail of echoes and the hallholographic soundstageChannel separation of 60dB or more (20Hz–50kHz) is rendered without blurring the image on either side.

• "Tamura Trans × Shortest Signal Pass" Equipped with two strictly matched Tamura super permalloy transformers. Its ultra-wide bandwidth and ultra-low distortion feature combine modern high resolution with a solid sense of reality that vividly depicts the framework of music. A short, condensed signal path in a fully shielded compact case delivers amplification purity directly to your ear.

Innovations Brought by Fully Balanced Circuits

The core of Pacto, the "Complete Balance Circuit," is not just a difference in connection type. It is a design philosophy that condenses the physical optimal solution for protecting weak MC signals from external noise and distortion into a compact chassis.

1. Why "Floating Differential"? — Self-Cancelling Noise

Pacto immediately floats signals input from RCA away from the ground, and internally converts them into a differential pair of "positive (+)" and "negative (−)" phases. Although it is an unbalanced connection, the essence of transmission remains symmetric.

• Technical Benefits: External noise embedded in the circuit is canceled out at the stage of signal recombination, extracting only the pure music signal.

• Listening Effects: An overwhelming reduction in the noise floor. From the pitch-dark silence, subtle reverberations that were previously inaudible emerge.

2. Uncompromising Architecture: Condensed Symmetrical Transmission

• Two Matched Tamura Transformers Equipped with two strictly paired Tamura transformers in a fully shielded, small, and lightweight (1.7 kg) classic metal case. The fully balanced circuit, identical to that of higher models, is fully enclosed in the smallest possible chassis.

• Short Signal Path and Simple Integration Supports a wide range of low-output MC cartridges with 0–3Ω and 40Ω impedance. The shortest signal path and easy handling with standard RCA ensure seamless integration into any analog system. The front panel is available in silver aluminum or black glossy, with optional all-white or all-black enclosures.