Liquid Amps

I agree the Pass Labs are very smooth and tube like without the disadvantages of tubes. They are fast and very fluid in the midrange.

Jim B...now there's a name from the golden days of audio.  A true pioneer who loved what he did and those of us who sold his inventions:

http://www.tnt-audio.com/intervis/bongiorno_e.html

His products were always VERY INTERESTING and sounded as good as he could make them.

RIP, James.

Valvet may also fit what you are looking for.

Good to see Bongiorno's amps getting coverage here.

Sugden for sure.

What kind of speakers do you have and how efficient?

Dunno what "liquid" means to you (no disrespect to Atmasphere/Ralph) but certainly very smooth and non-fatiguing...so consider a Nelson Pass First Watt design.  I have an F7.  Great tone and depth to the presentation but only 20 wpc into 8 ohms (30 wpc into 4).  Reno HiFi allows an in-home audition.  Demo unit available for $2495.  A very good value, in my O-pinion.

Review here:
http://www.theabsolutesound.com/articles/first-watt-f7-stereo-power-amplifier/?page=2

Reno HiFi listing here:
http://www.renohifi.com/FirstUsed/FirstUsedInStock.htm