The Mos-Fet series of amplifiers were a great learning experience for us. We learned and built new circuits for them that never allowed the internal circuits to overload short of clipping at more than full power. That eliminated all the nasty edges and brightness of transient distortion effects. The only limitation was that we had to limit the input bandwidth of the circuits to less than the maximum bandwidth of the output circuits, and we had not learned how to make the internal circuits super fast yet.
Now we have a huge bandwidth in our power amplifiers, the OmegaStar EX series are 3 db down at 500,000 HZ !!!! Take that anybody else. And that is the natural bandwidth of the cirucits, no feedforward compensation or other tricks to make an amp look better than it really is while introducing high frequency instabilities. So of course now the input bandwidth acceptance is nearly unlimited. The result is really dynamic, transparent and detailed sound with no glare or grain at all.
All of our older Mos-Fet series amplifiers (and all original Dynaco and Hafler amplifiers) can be upgraded to OmegaStars EX series amps, except for the integrated amplifiers. Economics kept us from tooling new circuit cards just for these out of production models.
Frank Van Alstine
