Reference LCR phono preamplifier with passive split RIAA equalisation.
SIEMENS C3g valves, amorphous core transformers and air coils
Handcrafted point-to-point construction in extruded silver, without PCBs
Gain: 39 dB | RIAA Accuracy: ±0.5 dB | RCA and XLR outputs (unbalanced)
Natural, detailed, uncoloured sound
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The development of the VPS-100 was the result of extensive and rigorous evaluation of topologies, materials, design, and implementation—all aimed at achieving the highest level of sonic reproduction. This model embraces a design philosophy based on passive RIAA equalization, favored by many purists over active equalization, as it avoids the effects of feedback loops where RIAA networks are typically found in active designs.
In passive RIAA equalization, RC (resistor-capacitor) networks are commonly used. However, capacitors exhibit the phenomenon of dielectric absorption, where part of the stored energy in the dielectric material is released with a slight delay, producing a subtle "ringing" effect that becomes particularly noticeable in fundamental notes, such as those produced by a piano.
LCR RIAA: A Superior Alternative
A more refined approach is found in LCR (Inductor-Capacitor-Resistor) RIAA equalization, a technique introduced decades ago by Japan's TANGO transformers, operating at 600 Ohms. While some modern manufacturers have adopted variations of these original circuits, the real challenge of a 600Ω LCR RIAA lies in its proper implementation: only two gain stages, providing sufficient overall gain and very low output impedance, are essential for optimal performance.
The best way to drive an LCR network is via a transformer. For this reason, in the VPS-100 we design and manufacture our own transformers, using a special amorphous c-core material and paper-insulated windings. This results in a far more natural, musical, and open sound, with outstanding definition in both macro and micro dynamics.
LCR Network and Split RIAA Design
Most LCR networks are based on double-T filters: one T filter handles the 50Hz and 500Hz poles, while the second T filter manages the 2123Hz pole. In the VPS-100, we took things a step further:
The 2123Hz pole is formed using an air-core inductor with no parasitic capacitance, located in the first gain stage.
The 50Hz and 500Hz poles are implemented directly at the output of the second gain stage, in a high-level signal environment.
This is a split RIAA design, based on two gain stages using SIEMENS C3g vacuum tubes, known for their exceptional reliability and lifespan of up to 10,000 hours.
Power Supply and Handcrafted Construction
The VPS-100 power supply features a 6CA4 tube rectifier and a choke-filtered design. The tube heaters are powered by passively regulated DC in the first stage and AC in the second. The entire unit is built without printed circuit boards, using point-to-point wiring with extruded and annealed silver wire made to our specifications.
Particular attention has also been paid to the mechanical isolation of the first gain stage and the 2123Hz pole inductors, achieved through a specially designed decoupling system. The entire assembly is mounted on an aluminum sub-chassis, along with a lower aluminum base, creating an extremely rigid and vibration-resistant platform.
Input Impedance: 47 kOhm / 200 pF
Output Impedance: 1200 Ohm
Outputs: Unbalanced RCA / Unbalanced XLR (pins 1 and 3 to ground)
Frequency Response: -3 dB @ 10 Hz – 40 kHz
Maximum Output Voltage:
5 V peak @ 1 kHz
50 V peak @ 50 Hz
RIAA Accuracy: ±0.5 dB from 20 Hz to 20 kHz
Channel Imbalance: < 0.2 dB
Gain: 39 dB
Power Consumption: Approx. 20 W
Dimensions (W x H x D): 400 x 180 x 400 mm
Weight: 25 kg
