I received my updated M2 power amps, now at M2A spec, my VTSP-360 to replace my VTSP-3A(r03) and my updated VTPH-2A. While I do not believe that I have given them a full chance to break in, I am extremely pleased with the sound. The entire set is dead quiet. Compared to the gear prior to its replacement and modification, the Herron stuff now seems a bit extended in the bass and the overall focus is a bit more oriented toward the lower midrange and upper bass rather than a bit leaner sound that this provided, before. The M2As have an FET front end and that may account for much of the difference, though I understand that the VTSP-360 has much better bass and weight than the predecessor VTSP-3A(r03). While I would not mistake the overall sound for tubes, it is a bit more tube-like sound than previously.
While my experience differs strongly from Blakcloud’s, his impressions represent his own personal take and are as valid as anyone’s, including mine. With stereo systems, everything matters, including one’s personal taste. For instance, I love Koetsu cartridges but others find them a bit lush and romantic, preferring the sound of Lyra cartridges that I find a bit hard. To each his or her own. Meanwhile, the challenge is to assemble a combination of components and cabling that appeals to you. In my case, the Herron stuff provides a sound that I really enjoy.