solid state vs tubes

Hello Unsound, you can see the issue in the curves of most semiconductors, perhaps easier when you compare input capacitance to current.

At any rate, its easy enough to hear! Get a set of ZEROs and a 4 ohm speaker, listen to the difference when driving direct or though the ZEROs.

Atmasphere, until I see more compelling evidence, or get a free trial, I'm not spending my hard earned money on something like this. I don't hear the need.

aTMAS,

Aren't 4 ohm loads more problematic for tube amps in general? Isn't that part of teh reason why you advocate 8 ohm or higher speakers for use with your tube amps?

I will gladly try the zeros if someone wants to loan me a pair. If I ever experiment with a SET amp down the road, the zeros might come in handy.

In my youth there was a definite difference in sound between tubes and solid state. Audio Research and Conrad Johnson vs. Krell and Mark Levenson. Today, the very best designs have closed the gap so that there isn't a solid state or tube sound. There are excellent examples of each. Today,Audio Research and Ayre sound more similar than different.

Just ask any (experienced) guitar player. ALL amps sound different, as well they should. I think the bottom line is that tube stereo amps sound better than ever but they're fussy, relatively expensive (relative to SS designs), and tubes start to kill themselves off pretty quick. I love the harmonic richness and appropriate tactile response tubes give to my various guitar amps (when biased correctly and using good tubes), but SS hifi amps (well designed ones) can, of course, sound amazingly musical and they seem to keep sounding that way much longer than tube amps with less upkeep. I prefer MOSFETs (warmer or something), and I am gonna try a class "d" hifi amp soon (modern pro audio is all about class "d"...those "phased array" speakers you heard at that concert with your girlfriend on your shoulders spilling beer on your head...likely class "d" powered).