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RE: Since you have a burr under your saddle

USERS ARE NOT EVIDENCE!!! A lot of users like Naim amps and some of the other so-called AB amps that exhibit zero crossing distortion. They likely can't hear worth a damn but that is another discussion...

Thanks for confirming what I have been saying, if an amp is AB or A and properly biased it doesn't have zero crossing distortion... If it is improperly biased and goes into cutoff or non-linear zone then it has zero crossing distortion and is effectively (regardless of mfg. claims) Class B because the bias is too low to keep the devices on through the handoff.

As I said, without a residual plot of the distortion component, we don't know if the Topping has zero crossing distortion or not. User feedback is not evidence.

Amir doesn't provide a residual distortion waveform and so we don't see if it is an issue or not. If it is not, then the Topping is not Class B and if it is there, even if small, then it is a Class B amp.

Honestly, the level of speculation in your responses is frankly amateurish and beneath the level of someone who has been an amp designer for a long time. You have NO idea if the amp has zero crossing distortion or not and the level of noise, distortion, and user feedback is not evidence of anything. Amir's measurements are not indicative either. One thing though is pretty clear is this, if an amp is underbiased then it will exhibit zero crossing distortion and is effectively Class B (even if claimed otherwise). There are no Class B amps that are completely free from this because it is inherent in the physics of the behavior of transistors.


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