I purchased this dac on Audiogon early last year. I immediately sent it to Gordon Rankin of Wavelength audio who replaced the dac section with the high speed version and the Quotient PCM and DSD 32/384 DAC Module, the latest and best sounding version. Gordon shipped it back with a new power supply as well.
I have lots of experience with Magnequest transformers (which Wavelength uses) and I can say that the difference between silver and copper is not subtle, certainly not when they are part of a product of such a nice sounding product. The only problem is the price of admission. But here's your chance to get the ultimate usb dac with silver transformers at the price of a copper one. BTW, silver takes several hundred hours to break in and that's already done for you in this unit :)
I'll ship the amp with Sylvania 71As and a Telefunken EZ80 rectifier plus a pair of Raytheon 71A spares and a National Electric EZ80 spare. I'll also throw in an Audioquest Diamond USB cable ($550 retail).
Shipping will be with UPS or Fedex at $100 to the US (I'll eat the excess). Paypal or transfer to my US checking account is fine.
Please ask any questions. I'll try to respond promptly.
Finally, No returns on this item. It functions perfectly, but for the buyer's peace of mind, in the remote case the buyer finds a functional issue I'll gladly pay for the repair cost with the manufacturer.