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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 1950s 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 PCBs 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.
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
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Immerse yourself in the enchanting world of music with the Rega - ISIS Valve - CD Player. This isn't just a device; it's an experience, a bridge to musical memories and new adventures. With its sleek design and unparalleled sound quality, it transcends being a mere piece of equipment. It's a statement, a lifestyle, a celebration of sound. Why hold back? Embrace the rhythm, live the melody!
Just got my new audio system from #TheRealMusicCompany. The sound quality is out of this world! It's like I'm hearing my favourite tracks for the first time again. #AudioBliss
Shoutout to #TheRealMusicCompany for their amazing customer service. They helped me find the perfect headphones, and I couldn't be happier with my purchase. #CustomerServiceWin
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Hey There, Audiophiles!! We, too, are music enthusiasts just like you. We understand the pure joy of listening to a new track and the thrill of hearing every note in crystal clear quality. That's why we're committed to providing you with the finest audio experiences. With us, it's not just about sound, it's about creating unforgettable musical journeys that touch the soul. Join us, and let's celebrate the magic of music together!
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Trusted Since 1990.
For over 30 years, we've been the heartbeat of New Zealand's Hi-Fi scene. Our pride lies not just in the products we offer, but in the exceptional customer service that forms the heartbeat of our operations. We don't just sell equipment; we share in your love for sound. No matter what you're seeking, we're here to guide, assist, and ensure your journey into the world of superior sound is nothing short of extraordinary. With us, you're not just a customer, you're part of our vibrant, music-loving family.
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That goosebumps-inducing moment when the first note hits, that's what we live for. We love seeing our customers' eyes light up as they experience the breathtaking sound quality of their new audio system. It's not just good; it's jaw-droppingly good. It's the kind of sound that makes your heart skip a beat and leaves you craving for more.
In a world of automated responses and impersonal interactions, we take pride in offering good old-fashioned customer service. We're here to guide you, help you, and ensure your journey into the world of high-quality sound is smooth and enjoyable. Feel the difference of personalised service that's as impressive as the sound quality of our Rega systems.
Step into our world of sound and join the chorus of happy customers who've found their perfect audio match with us. Their rave reviews are music to our ears, and we can't wait for you to join the band. Here's what they have to say:
“Absolutely love the speakers. The speakers do show of the recording. If however the recording is not well mixed it will show the listener as well that it was a bad recording. When they did a bond song together. However if you have a well recorded album like London Grammar or Faithless etc the music is not just fun but dynamic and entertaining. Totally recommend these speakers. ”
“I’m loving the minimalist design. The warmth and depth of sound this turntable achieves makes listening sessions bliss”
"Just upgraded my phono cartridge to the Linn Ekstatik. This is a truely amazing cartridge. Running on my Linn LP12 Klimax turntable. The amount of information extracted is incredible. Very detailed presentation even at reasonably low volume. I am sure that as the moreI use it the better it will get. A worthwhile upgrade. Thanks to all at The Real Music company"
“The quality and reproduction of my Lps lifted 10 fold, the sound is so pure, like listening a new Lp, I'm hearing things i haven't heard before. Visiting The Real Music Company and meeting Carey was a true pleasure. The service was impeccable, no rush, listened to my wants and suggested the perfect set up for me at a very acceptable Price. Thank you”
Our commitment to delivering top-tier audio experiences has earned us glowing reviews from customers and industry experts alike. Our passion for sound, dedication to quality, and exceptional customer service have made us a favourite in the audio community. But don't just take our word for it - see what our satisfied customers have to say!