Rega Valve ISIS Reference DAC/CD/MP3/WMA Player

£7,150.00 (FREE UK Delivery)
Item out of Stock  |  Usually dispatched within 24 hours
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  • Laser Semiconductor
  • Wavelength 780nm
  • Digital sampling frequency 44.1kHz
  • Power Consumption 46w
  • Phono Unbalanced 2.4V source impedance 600 Ohms
  • XLR Balanced 2.4V source impedance 600 Ohms
  • Co-Axial SPDIF 0.5V source impedance 75 Ohms
  • Toslink compatible output
  • USB 16bit 44.1/48kHzTHD+Noise< 0.06%
  • Frequency Response 30Hz - 20kHz +/-0.5dB
  • Rega custom designed and CNC machined aluminium case work
  • 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
  • Dimension needed to operate  W 434mm x D 350mm x H 200mm
  • Weight 19.5Kgs

Rega's now legendary head electronics engineer Terry Bateman spent 10 years researching the concept of a CD player using valves in the output amplifier. Valves have been widely used in musical instrument and recording amplification from the 1950's to the present day, therefore it made great sense to develop a valve based CD player to match that of the signal chain found in such applications.

This approach kept the circuit straightforward. This is mainly because musical instrument amplification is not excessively hindered by some of the folklore surrounding certain aspects of valve audio design. He took the approach of combining the technical and sonic attributes of valves in a differential instrumentation amplifier circuit driven from differential output DAC with a passive LC filter.


The valve Isis shares the same digital and USB sections as found in the solid state version, however, the analogue stage is valve based with passive filtering. This stage uses two military specification triple mica 5814A (ECC82/12AU7) triodes being driven by the revolutionary Wolfson WM8741 ultra high performance digital to analogue converter.

The output buffer and transformer driver stage uses two ECC88 (6DJ8/6922) triodes. This, like its solid-state stable mate, is of an un-orthodox design. The design goal with this player was to keep away from the normal design approach of "let’s run it through a valve to make it sound warm", but take advantage of industrial valve circuits to make an articulate and competent valve based CD player. Careful choice has been made for every component in the digital and the analogue signal path to ensure the integrity of the signal.

Careful design of the PCB's ensures isolation of not just the digital and analogue sections, but also the motor, display and user interface processor. All sonically critical electrolytic capacitors have been by-passed with polypropylene or polyester film capacitors.

In addition to this, large value electrolytic capacitors have also been by-passed with audio grade electrolytic capacitors. Power supply impedances in the digital to analogue converter are kept very low by the use of solid polymer capacitors. All power supplies utilise custom Rega K-Power smoothing capacitors, and fast diodes have been used throughout in power supply rectification.

The Isis uses enhanced and optimised control code for the control of the CD processor and user display; this will speed up the initialisation process by means of a tighter control interface between the user micro and CD processor.


The differential output of the digital to analogue converter drives a valve differential (operational) amplifier, with a very modest amount of feedback to stabilise the operating conditions. The 5814A based differential amplifier, with a solid-state current generator in its tail, takes full advantage of the differential output from the digital to analogue converter. This is followed by a passive Butterworth second order LC filter. Finally, this signal is buffered using a low anode resistance ECC88 triode to drive the output and balancing transformer.

In design it was felt that unnecessarily high levels of THD would unduly overwhelm the qualities of the digital stage of the Isis. The overall THD is typically 0.06% being prominently even order, where the 2nd harmonic predominates. This will give the sonic dynamics of the valves without dominating the sonic qualities of the digital section.

After many hours of tube rolling we found the 5814A differential amplifier position was best on the grounds of micro-phonics, reliable operation and sonic qualities. Both the HT & LT power supplies are fully regulated and use the same power supply parts as used in the solid state Isis. Like the solid-state analogue stage, the Valve Isis has its own dedicated 50VA mains transformer, ensuring galvanic isolation between the digital and analogue sections of the player.

The Isis has an isolated balanced output, and in keeping with the spirit of the valve circuit topology we have opted to use a transformer in this position. This balancing transformer is made to the same exacting standards of that found in the Ios MC amplifier.

We hope that you enjoy this product as much as we have enjoyed creating it.

All these features amalgamate to create the supreme level of performance found in the Isis and provide a perfect partner for the Rega Osiris amplifier.

We endeavour to despatch same day for orders placed up to 2pm on available stock items (items with stock message "Usually dispatched within 24 hours"). Please remember to check with us first for a physical stock check if next day delivery is important to you. Any items with stock message "Usually dispatched within 72 hours" are items that we do not hold in stock but order in from the importer or manufacturer as soon as a customer order is recieved. Occasionally these may be delayed beyond 72 hours due to importer/manufacturer stock levels but we will inform you as soon as we can if this is the case.

UK ORDERS:  We despatch the bulk of our UK mainland items on a 24 hour service – Free of Charge.  Non Mainland locations - Isle of Man, Isle of Wight, the Scilly Isles, the Scottish highlands and Islands, the Channel Islands and Northern Ireland may take a day or so longer and are not Free of Charge. Smaller items are delivered using Royal Mail recorded delivery or special delivery. Larger items are delivered using a courier service such as Interlink Express, DPD, UPS or DHL. 

INTERNATIONAL ORDERS: We offer competitive rates which can be confirmed by email. Please just ask – we will need a full delivery address and telephone number. Smaller items are delivered using Royal Mail Small Packets Airmail with International Tracked and/or Signed depending on value of item and availability of the service. Larger International shipments are sent by insured and tracked services using DPD, DHL or UPS. If there are any delays due to specific customs regulations, etc, you will be contacted by Turntableworld or by the courier with a request for any further information required. Customs duties do not apply for shipments into any EU country (for a full list please refer to the EU Country List). Customs duties can apply for countries outside of the EU. Customers in these countries are responsible for all taxes and duties incurred when the items enter their country.

COLLECT IN STORE OR HOME INSTALL:At the request of the manufacturer some items cannot be supplied by mail order but you can click and buy them and then elect to collect them from our store or arrange a home install (if applicable). Applicable items clearly state that they are Collect in store or home install. Once ordered you will receive a message prompting you to contact us by phone or email to arrange for us to deliver and install or to reserve and collect from our store at your convenience, you will also be advised of the delivery time / stock availability as not all Home install / collect in store items are held in stock. 

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