The "Low Current" part of LCPS is of some concern. I don't see what it's rated at but you need a full amp of current at 5V and 1.5A is better, providing less stress on the PSU components. You don't need a bipolar PS unless you build an output stage that requires one. Note that most of the Squeezebox mods involve removing the stock op-amp output, which cleans up the signal path considerably but causes some other problems such as the absolute phase is now inverted, the signal level is about 1/2 of standard and driving long cable runs is out. Which is why I used the Burson Buffer modules originally and then designed a tube stage later.
As for the tubes, I like what they do and the sound is far from muddy. Tubes in a line stage can be very linear unless designed not to be. IMO most "muddy" tube sound is tied to power amplifiers that have a fairly high output impedance and don't control the woofers very well. Not all tube amps are like this and some folks are very happy with the compromises of those that are. I have both tube and SS amps in my system and I like them both, they just do things differently. One of my amps is an OTL which is lousy at driving high current loads like 4 ohm woofers but it excels in the middle and high frequencies, which is where I use it. I like what it does so well I can accept the drawbacks. It's all about compromise, every component has some, the question is which ones can you tolerate.
Those that have heard my tube out SB have all been very positive in their comments. I am very happy with it but you can be sure some time in the future I will change it again. I simply can't leave things alone. Hell I modified my wife's clock radio this morning to disable the alarm.
