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Rega Valve Isis - Valve CD Player The Rega Valve Isis is a premium valve-based CD player that combines advanced digital technology with classic valve amplification to deliver warm, articulate sound and exceptional signal integrity. Designed by Rega's head electronics engineer Terry Bateman, it offers superior audio performance for discerning audiophiles. Product Overview After 10 years of research, the Valve Isis integrates valve amplification in the CD player's output stage, inspired by musical instrument and recording amplification techniques since the 1950s. Its straightforward circuit design leverages the technical and sonic advantages of valves within a differential instrumentation amplifier, driven by a differential output DAC and a passive LC filter. Key Features Valve-based analogue stage using military specification triple mica 5814A (ECC82/12AU7) triodes Wolfson WM8741 ultra high-performance digital-to-analogue converter Output buffer and transformer driver stage with ECC88 (6DJ8/6922) triodes Carefully selected components ensuring signal integrity throughout digital and analogue paths Isolated PCB design separating digital, analogue, motor, display, and user interface processors Bypassed electrolytic capacitors replaced with polypropylene or polyester film capacitors for enhanced sonic clarity Custom Rega K-Power smoothing capacitors and fast diodes in power supply rectification Enhanced control code for faster CD processor initialisation and improved user interface responsiveness Fully regulated HT and LT power supplies with dedicated 50VA mains transformer for galvanic isolation Isolated balanced output with high-quality balancing transformer matching Rega Ios MC amplifier standards Technology The Valve Isis features a differential output DAC driving a valve differential operational amplifier with minimal feedback for stable operation. The 5814A-based differential amplifier, combined with a solid-state current generator, is followed by a passive Butterworth second-order LC filter. The signal is then buffered by a low anode resistance ECC88 triode to drive the output and balancing transformer. With a typical total harmonic distortion (THD) of 0.06%, predominantly even order harmonics, the player preserves valve sonic dynamics without overpowering the digital stage's qualities. Extensive tube rolling confirmed the 5814A triodes as optimal for microphonics, reliability, and sound quality. Specifications Laser Semiconductor Wavelength: 780nm Digital Sampling Frequency: 44.1kHz Power Consumption: 46W Phono Unbalanced Output: 2.4V, Source Impedance 600 Ohms XLR Balanced Output: 2.4V, Source Impedance 600 Ohms Co-Axial SPDIF Output: 0.5V, Source Impedance 75 Ohms Toslink Compatible Output USB: 16bit, 44.1/48kHz, THD+Noise Frequency Response: 30Hz - 20kHz ±0.5dB Rega Custom Designed and CNC Machined Aluminium Casework High-Quality Anodised Finish Aesthetic High Gloss Black Facia and Lid CNC Machined Matching Remote Control Dimensions: W 434mm x D 350mm x H 112mm Operating Dimensions: W 434mm x D 350mm x H 200mm Weight: 19.5kg What's in the Box Rega Valve Isis CD Player Matching CNC Machined Remote Control User Manual Experience the supreme performance of the Rega Valve Isis, the perfect partner for the Rega Osiris amplifier.