Beginners Luck simple amplifier

The not so simple amplifier 😉
combined_dut_comparison.png


combined_dut_comparison.png
 
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Very high THD figures, what does the "luck" consist of?

10 to the power of zero = 1 (%) - the best of the one you compare with are at 0,3% - isn't that start clipping level THD value?

As usual quite "strange" things coming out here.,.. seems unlucky,,,?

Is a new design showing 0,7% THD @ 1W a showpiece?

Are all charts from simulations - also the commercial designs? If so, there is something wrong with the simulations.

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Just a thought ...
Given the relatively high amount of harmonic distortion that speakers exhibit driven at medium to high level, what would 1% of amp distortion do?
Most speakers can't even accurately reproduce a number of waveforms.
I guess that "LUCK" might come into play if one component's distortion directly subtracted from another component's distortion.
inadequate thermal compensation
Could someone elaborate/explain to me how/why "thermal compensation" is relevant to BJT output transistors when large cooling is applied and
where the driver transistors are kept independently cool ?
There are things I just don't know about.
 
A triple EF output stage with zobel in the wrong location and inadequate thermal compensation. What could possibly go wrong? 🙂
The EF3 (in #9) is probably fine.
The zobel is also fine. The location is correct. The value chosen might be debatable.
For thermal coupling, if you mount the VBE multiplier on the heat sink. It is absolutely fine even with a small heat sink.