"Pooh Bear" wrote in message
...

Stewart Pinkerton wrote:

almost all modern electronics uses MOSFETS

Uh ! Pardon ? The amplifiers I've been associated with in recent times
have actually stopped using Mosfets as output devices and we're using
bipolars again ( cost reasons - and limited sources of nice lateral
mosfets ).

Not a single mosfet in the signal path.

Care to elaborate ?

**MOSFETs will come into their own when switching amplifiers hit the
mainstream in a big way. For the here and now, however, BJTs offer some
compelling advantages over MOSFETs. BJTs:

* Are more linear.
* Are far more linear, at modest bias currents.
* Offer higher peak current capacity, at lower cost (though this aspect is
changing).
* Do not suffer the problems associated with falling gm at elevated
temperatures.

And, before anyone jumps all over me, I am well aware of the very
significant advantages conferred by the use of MOSFETs. None of those
advantages translate to superior sound quality, however. Those advantages
include:

* Better HF response (pretty much academic, however, unless we're talking
switching amps).
* Slightly lower levels of complexity, due to ease of drive and lack of
current limiters.
* No secondary breakdown effects.


--
Trevor Wilson
www.rageaudio.com.au



--
Trevor Wilson
www.rageaudio.com.au