The Osiris is the culmination of 32 years experience in solid-state amplifier development. A no compromise, super high performance, 162 W into 8 Ω (250 W, 4 Ω), dual mono amplifier housed in a custom Rega CNC machined aluminium case. The Osiris uses a low distortion high linearity and a bandwidth common base voltage amplifier driver stage. This type of symmetrical circuit topology will provide the necessary voltage swings to enable the Osiris to drive any speaker system with the minimum of distortion. Eight Sanken 200 W output transistors are used in a “triple” high current output stage enabling the Osiris to drive even the most awkward of speaker systems with ease. The cascoded differential input amplifier uses two low noise LED referenced current generators. The open & closed loop feedback levels and gain bandwidth product components are optimised to give a tight and controlled sound stage, especially at the low frequency end of the audio range. Nichicon audio grade capacitors are used in bypass and de-coupling positions. Electrolytic capacitors have been bypassed with polyester capacitors where necessary, improving on the HF performance. Low inductance film SM power resistors are used in the output stage. The Osiris has 2 purpose designed 400 VA toroidal transformers with high-quality core material. They are mounted uniquely to the chassis to reduce noise transfer, even under challenging line conditions. Combined with 40,000 Micro Farads of Rega K-Power smoothing capacitors, these transformers provide ample current for difficult loads. The power supplies use fast recovery rectifier diodes for a cleaner DC output, while a regulated power supply with a low noise voltage reference is used for the input and low-level driver stages, ensuring pure sound quality. Additionally, separate power supplies are dedicated to the audio circuits, eliminating any potential interference from other components.