The response has been fantastic. My immediate impression was that the sound was more dynamic, the soundstage was taller and wider, and there was more clarity. Bass was better controlled and more powerful. Build quality really impressive. Many customers ay that this was the most surprising improvement they have made in their system.
People describe it as improving every CD in their collection.
Many customers have played with a variety of tubes to see if they could squeeze even more performance from the CD-1. I get many questions about what tubes. I have seen many different letters from customers suggesting various tubes for the CD-1 that make the performance even better. One of the tubes that comes highly recommended is the GE 5751. We have a small bonus for anyone buying the CD-1.