Orpheus MK3S

About the Orpheus MK3S

The Thrax Audio Orpheus MK3S is a premium phono stage designed for audiophiles seeking the highest fidelity in vinyl playback. It features two tube gain stages with zero feedback and a passive LCR equalizer for precise RIAA equalization. The unit includes a built-in step-up transformer for moving coil cartridges, programmable gain and loading, and accepts both balanced and unbalanced inputs via RCA and XLR connectors. It switches ground planes with input selection to prevent ground loops and offers programmable absolute phase per input. The power supply uses a choke input rectifier and shunt regulated constant current PSU for ultra-low noise and excellent dynamic behavior. The chassis is solid aluminum with modular construction and microprocessor control. The input stage uses a super low noise D3a German Post tube loaded by a constant current cascode, feeding a custom passive LCR RIAA correction filter made with OFC coils and silver capacitors. The Orpheus MK3S is designed to deliver transparent, dynamic, and natural sound without the artifacts of feedback or hum loops, making it a modern masterpiece in tube phono preamplification.