matt thanks for the reply ... I'm afraid to import a crack, the box is too big and I have to pay a lot of taxes here in Brazil with speedball will be even more expensive, I'll have to think yet ... Thanks
Thanks for help tomb :) I can only spend up to $ 300 ~ 400 max on a tube amp, the mainline amp has passes my budget. Would have some to recommend me? The dac I just had to today ODAC and Asus xonar DX.About USB powered I saw your project and others like iUSB but iUSB is very expensive and your project just sells the PCB or has all the pieces to assemble?