arnyk wrote: > The lowest distortion way to build the output stage of a solid state > power amp is a carefully biased class AB. The trick is to come up with > the right bias as a function of current and temperature. Needless to say > this is far from being an insurmountable problem as long as you stay > away from pure class B or pure class A. As with many things in life, the > optimum is a carefully chosen mean or compromise. > > If you depart from the ideal too far in the direction of Class B you get > crossover distortion which is especially bad sounding because it affects > sound quality at all power levels. > > If you depart too far from the ideal in the direction of Class A you > have a problem with what is called gm doubling. This is a fairly deep > technical issue further elaborated on by Douglas Self in his various > well-known publications related to power amp design and also > 'Douglas-sel on SS power amps,' > (http://douglas-self.com/ampins/dipa/dipa.htm#5) as well as 'Solid State > amplifiers by teemu_kyttala_v1.0.pdf' > (http://www.thatraymond.com/downloads/solidstate_guitar_amplifiers_teemu_kyttala_v1.0.pdf). > I have personally observed and addressed this problem in my own > unpublished power amp designs.
Hi Arny! Thank you for your clear response. I'm probably best off with my Class A/B Logos which at least sounds as if it's done well, and save money by avoiding the pure Class A Inpol 2. I suspect you've just saved me from falling for an expensive "down-grade"! Dave :) ------------------------------------------------------------------------ Golden Earring's Profile: http://forums.slimdevices.com/member.php?userid=66646 View this thread: http://forums.slimdevices.com/showthread.php?t=106914 _______________________________________________ audiophiles mailing list [email protected] http://lists.slimdevices.com/mailman/listinfo/audiophiles
