Well I received the Melody SHW1688 Signature preamp. Wow, I can't sing enough praise for this fabuoous tube preamp. The reason I decided to get this preamp was a suggestion from my audiophile friend when I talked to him about my woes with hearing slight edgy electronic hint in the sound I'm hearing from my high end system that otherwise sounds absolutely fabulous. My system consists of Dynaudio Evidence Temptation speakers, MBL9007 reference dual mono amps being driven directly by Theta Digital Generation VIII dac with its built in preamp. Thinking it could be the cable, I tried various top end cables which helped tremendously: Tara Labs The One bi-wire speaker cables, HT Cyberlight P2A interconnects with custom regulated power supply, and NBS Statement power cords. Using Melody preamp, totally rid of the sight ege and electronic hint in my sound and totally made the presentation natural and musical with great emotional impact that totally absorbs you into the music. I can not be any happier with the move I made with this preamp. I was thinking of going with MBL6010 or Viola preamp but I am glad I didn't. Not only I save myself a great deal of money but I'm in bliss with the sound I get from this preamp.