Here are some answers to the discussion so far. Please let us know if you have any other questions.
* The headphone amp sound quality is the same as WA7
* There are 2 digital inputs - 1 USB and 1 optical
* RCA output is no longer available in this version
* You can use the 7d as a preamp by using the 1/4" output
* We plan to release the pricing for the new tube power supply the same time. Sorry but no trade-in.
* Estimated delivery date is early May. Special pricing...