I bought one of those Muse Dacs with 4 TDA1543s in it and it was a waste of good money. Even @ $60.00. I installed a Burson super reg and gave it a listen. Then I hooked up a Behringer U202 USB audio interface that I bought for $26.00 and it blew the doors off the NOS DAC even with the regulator upgrade. I'm just going to get my Aragon A2D2 DAC fixed and move on to what I know. Tube components. I'm presently working on a parafeed 396A pre and I will keep you guys updated.