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In Reply to: RE: Thank you, exactly. posted by morricab on February 11, 2025 at 01:02:23:
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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Follow Ups
- RE: Thank you, exactly. - 13th Duke of Wymbourne 02/11/2513:23:03 02/11/25 (8)
- RE: Thank you, exactly. - morricab 07:08:36 02/12/25 (5)
- RE: Thank you, exactly. - 13th Duke of Wymbourne 12:24:48 02/12/25 (4)
- If you have a "dead zone" - Steve O 14:50:08 02/12/25 (3)
- How do you classify taxonomists? - 13th Duke of Wymbourne 11:18:59 02/13/25 (1)
- Hadn't considered that until now - Steve O 15:41:18 02/13/25 (0)
- RE: If you have a "dead zone" - morricab 06:37:17 02/13/25 (0)
- RE: Thank you, exactly. - Tre' 18:08:12 02/11/25 (1)
- RE: Thank you, exactly. - 13th Duke of Wymbourne 12:33:54 02/12/25 (0)