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SS amp mosfet 'haze' - ever experienced this?

Tried a new amp in my system on the weekend: the well-reviewed Gamut D200 mkIII (partly based on HP's great review), a single-mosfet SS design. At the dealers' place, it sounded great (speakers were Wilson Benesch Discovery, an isobarak, lower-efficiency design). I can't use a tube amp right now (unfortunately!) due to pending child and the system is on a LOT (2-ch/HT mix), so am looking for the most full-bodied SS amp I can find (prefer fully balanced design to match my modded SF Line 3 pre).

Well, to my surprise, the amp did NOT work out as well at my place. My speakers are 97db Coincident Total Victory. Yes, it was full-bodied, but I was definitely aware of this haze, or veiling around each note. I have a friend who designs amplifiers, and he said that this is inherent of mosfet designs. I called Israel (Coincident) and he was not surprised that I only heard this once I got back to my place, due to the high resolution abilities of my speaker vs the speakers at the dealer's. I guess I will be sticking with my Sim Audio W-3, as it is much 'cleaner' on my system (given that I must stay with SS). Too bad, 'cause my Sim W-3 definitely has the edge in clarity, but the Gamut was a touch more full-bodied.

Has anyone else experienced this 'haze' with a mosfet-based design? I admit, those with higher-efficiency speakers like mine (97db/14ohm) probably are NOT using higher-powered mosfet designs anyways, but I would like to know how others feel about mosfet designs and this issue I had.
sutts
muralman1
1,527 posts
 
I don't want an amp that colors the signal. I color it to my choosing with a tubed DAC. My amp, and preamp's job is to magnify that DAC's sound, and nothing more.

The question was, do we hear Mosfet haze? My answer is a question, relative to what?

On Bipolar amps. I have preamps that are bipolar, and damn they would make a great amp.
tvad
9,467 posts
 
08-22-06: Muralman1
I don't want an amp that colors the signal. I color it to my choosing with a tubed DAC. My amp, and preamp's job is to magnify that DAC's sound, and nothing more.
However you approach it, you're creating a colored sound, correct?

IMO, there's no difference between your approach and one that takes an uncolored signal and colors it with amplification. The result is the same. Colored sound.

You say tomato, I say to-mah-to.

If MOSFETs haze, fog or vaseline the sound...so be it. The result on the Moscode 401HR is a sound I like, and that's all that matters.
muralman1
1,527 posts
 
Yeah, but I get to choose the color of the day. You know that about tubes....
tvad
9,467 posts
 
08-22-06: Muralman1
Yeah, but I get to choose the color of the day. You know that about tubes....
There's no difference between our systems there either, as I can roll half a dozen or more tubes in both my preamp and amplifier, and by so doing I can change the sound of the system in a number of ways...from uber clarity and resolution, to warm and fuzzy and less resolving.

I'm not trying to one-up you here at all, but you cannot claim "Yeah, but..." as a benefit or difference between your chosen method and mine. It still comes down to shifting the coloration by changing tubes.

Which seems to highlight the superiority of tubed gear, even if a system utilizes only one tubed component. Eureka!
muralman1
1,527 posts
 
The question still is, "Has anyone else experienced this 'haze' with a mosfet-based design?"

The answer is.......... drum roll........... Yes!
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