On Sat, 25 Mar 2006 15:05:58 GMT, "Ian Iveson"
wrote:

Chris Hornbeck wrote


For example, the
gain of both tubes and transistors can be very sensitive to temperature.
With negative feedback, the important parameters of the amplifier are set
by a pair of resistors, whose properties can be made to be very stable and
independent of temperature.

Perhaps not the best example, because vacuum tubes operate
in their own very high temperature environment and were made
to tolerances impossible for semiconductors, buy yeah, a
feedback loop of a pair of resistors is a pretty durned
good reference.

Wot, no compensation? Is that possible?

More to the point, Chris's comment is bunk. Semiconductors are made to
tolerances of a couple of microns (less in the case of ICs), while
tubes are lucky if they're made to a tenth of a millimetre.
--

Stewart Pinkerton | Music is Art - Audio is Engineering

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