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General Asylum General audio topics that don't fit into specific categories. |
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In Reply to: RE: mkuller is correct * posted by Tre' on July 27, 2018 at 15:40:47:
This post reminded me of the new Vitus Audio integrated amp, that can operationally be switched from a 25WPC class A amp to a 300WPC class AB amp.
I'd love to know just how much needs to be switched around to accomplish this. My suspicion is that there are lower voltage power transformer taps for the output stage (maybe everything else is on its own set of windings) and a very different feedback arrangement for each setting.
There is definitely a difference between designing a 25WPC class A amp and a class AB amp that won't go into cutoff until you push past 25WPC. Rail voltage is higher in the class AB amp (Tre has pointed out the drawbacks to raising rail voltage and decreasing collector current) and there is a need for some serious feedback to keep the crossover distortion at bay which just isn't a requirement for the class A design.
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- RE: mkuller is correct * - Caucasian Blackplate 07/28/1810:22:37 07/28/18 (0)
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