On Jan 3, 2007, at 9:21 AM, Tim Øsleby wrote:

> Also used in audio systems. my little understanding is that the  
> advantage
> using them is that they are more efficient than other transistors,  
> in other
> word more power, less spill heat.

Only in certain applications.  As far as audio goes, the heat output  
depends more on the topology (class A, AB, etc) than the componentry.

- Dave


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