My amp is class A to around 50 watts and is SS amp, low level listening in my system is between 50-60db in my room. Every detail is in tact in every way as I listen to Leo Kottke and Michael Hedges this afternoon. That said, the amp is very warm even at this no more than 2 watt output. As far as tube or SS..Timo has the best advice, you should listen in your system at your Spl.
Dave
Dave