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RE: Thank you, exactly.

As an aside, newish brand Infigo claim to operate always in class A using a novel sliding bias scheme but JA's measurements showed it rife with cross-over distortion though THD was still low and the reviewer loved the sound. I've no idea how much bias is required for a 'smooth' handover between push & pull and vice versa but many years ago Douglas Self wrote a series of articles about audio power amp design and claimed, IIRC, that optimally biased class B actually produced the lowest distortion. I didn't pay much attention at the time so don't know his reasoning but think it was that the variation of composite transconductance of the push-pull pair could be made much less through the cross-over region than for an AB pair. This was set in the context of applying as much loop gain as possible so, perhaps, with the right class B bias and a lot of feedback Topping has gone in this direction and try maximize efficiency to go against class D designs.


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