AI-generated product photo — not official manufacturer imagery.
Estimated price (community-sourced)
Around — community and catalog average, updates slowly
The Ypsilon PST-100 MKII is a high-end tube line preamplifier aimed at audiophiles seeking maximum transparency and low coloration. It combines a no-feedback single-ended active gain stage with a custom transformer attenuator and offers both passive and active operating modes. The active stage uses one Siemens C3m tube per channel, transformer-coupled to the output, providing a gain of approximately 16.9 dB (x7). The power supply employs valve rectification (EZ81/6CA4) with a choke filter. Volume is controlled by a transformer-based attenuator with 31 steps, avoiding the sonic compromises of resistive potentiometers. In passive mode the signal is routed only through the transformer attenuator with no added gain, ideal for low-output-impedance sources; in active mode the C3m tube stage adds gain while maintaining low feedback and high linearity. The preamp provides six inputs (five unbalanced RCA, one unbalanced XLR) and three outputs (unbalanced RCA, unbalanced XLR, and a buffered Tape Out). Construction features point-to-point wiring with custom pure silver wire and in-house-wound transformers. It includes remote control for volume and input selection, weighs about 25 kg (55 lb), and measures roughly 400 x 180 x 410 mm (15.6 W x 7 H x 16 D). It is widely described as extremely transparent and quiet, approaching a straight-wire-with-gain presentation, and omits balance and mono controls in favor of a minimalist, purist design.
Amplification power output and characteristics
Analog signal output specifications
Input and output connections
Size, weight, and appearance
Specifications are community-contributed and may not be accurate or complete. Verify all details with the manufacturer before making purchasing decisions. Terms & Conditions
The closest alternatives on specs, description and the systems they turn up in, with the specs they share set side by side.
The Aelius II's output impedance is 0.25Ω against the PST-100 MKII's 150Ω, its input impedance 47Ω against 50Ω, its weight 45 kg (99 lbs) against 25 kg (55 lbs), and its depth 425 mm against 410 mm.
The NHB-18 NS Mk1's output impedance is 75Ω against the PST-100 MKII's 150Ω, its input impedance 30000Ω against 50Ω, its weight 27 kg (60 lbs) against 25 kg (55 lbs), and its depth 415 mm against 410 mm.
The Phaethon's output impedance is 0.5Ω against the PST-100 MKII's 150Ω, its input impedance 47Ω against 50Ω, and its weight 35 kg (77 lbs) against 25 kg (55 lbs). Both share width (400 mm).
The C-3900S's output impedance is 50Ω against the PST-100 MKII's 150Ω, its input impedance 40Ω against 50Ω, its weight 25.3 kg (56 lbs) against 25 kg (55 lbs), and its depth 412 mm against 410 mm.
The specs and the pairings above are open to everyone. Sign up and you get the system builder, the assistant, a compatibility check against the gear you already own, and a watch on this product so a price or pairing change reaches you.
Sign up freeSoulution 326