the hegel h390 differs sonically from the h20 power amp in that the h390 has a more rolled off high end and slightly less defined upper midrange, whereas the h20 is noticeably more open and revealing in those areas -- the h390 is a bit of an anomaly in their integrated line, it is the one unit exhibiting somewhat softened/rounded upper registers -- very useful if one’s source or speakers are a little ’hot’ up top and can use some calming down for more ’musicality’
some of the older van alstine power amps (like the synergy series), as wonderful values as they can be, do have a slight bit of solid state sizzle but the more recent more expensive ones such as their ’set’ series are very very clean sounding, if a touch less grippy down below than the upper hegels
all the above comments from my actually owning the amps mentioned, driving big proacs, vandersteens, harbeths and magnepans over time