2. amps-preamps
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Mosfet mist?

Greetings,

I have read several articles on the sonics of mosfet amps to include Adcom,B&K,Counterpoint,Perreaux,etc. What exactly is mosfet mist and how would one know what to listen for. Are some amps more prone to this mist than others? I have a Perreaux 1150B doing woofer duty on a pair of Focal 706s spkrs(A modified Parasound 1000A on top)How would say the 1150B compare with a B&K in relation. Thanks.
south43
nordic587
45 posts
 
Thanks Atmasphere. I learned something today. Pls excuse my uninformed sarcasm. I was caught up in a mirthful moment. I will have to scrutinize my 1995 Halfer 9180 for this phenomenon. It uses lateral MOSFETS. I do LOVE the sound, never tiring.
magfan
1,583 posts
 
point is, Woof, that some knowledge of how semiconductor devices is made would go a long way to help people understand what they are buying into. Toss in a dose of device physics and than you can talk.

Talking about a particular tech having certain characteristics is generally a no-win with many other factors tossed into the mix.

I worked in-fab since the early 70s, first making quartz lo-frequency oscillators and later CMOS / BiPolar and other integrated devices and still later making discrete HexFets, IGBTs and FREDs. It was a lot of fun, with the first ICs I worked on having 6 or 7 micron geometries on 3" wafers!

But anyway, show me a good design using any device and you'll be hearing good sound. Bad sound can come from any technology.

If anyone has any curiousity about how any of this stuff is made, I'll do my best to answer or find out.
wolf_garcia
6,708 posts
 
Who you calling "woof?" I've also worked on wafers...I spent the holidays working hard on drinking beer while eating only seeded wafer crackers.
rleff
1,065 posts
 
Magfan what probers and testers have you worked on;I am in ate final test.
magfan
1,583 posts
 
Never ever worked test /probe. Did some Reliability (1000 hour burn in) on some tests I ran with induced leaks in a vacuum system, but NEVER probe.
I think that would be some valuable information about some of the differences between MOSFET and BiPolar designs.

I was into diffusion.....oxide growth (insulator) and implant diffusion. Also spent lots of time with metalization. Aluminum interconnects and various backmetals and some platinum silicides. I also worked in photo / etch but that wasn't where my heart was.

One entire fab I worked in was sold to the Chinese. Every machine, valve, pump, filter, bit of plumbing and microscope. The works right down to the flooring. I even caught 'em photographin the Specification Book.....A VERY NO NO thing to do. BUT, the bosses didn't give a XXX.

Sorry Wolf.....a typological error.
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