Autoformer? isolation is a 'transformer' Why?

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keithp

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Her' 'GrandMasters'

Point of question is why would a modern manufacturer of class-AB amps introduce a 'primary secondary' windings to then load?
Of course there's an inefficiency factor or loss in energy transfer is not an issue in respect to resultant 'load impendence balancing' we also see implemented in triode output stages is a different subject vs solid state silicon/mosfet class-AB
*Why in modern class-AB amplification is this stage employed, is there not another type of 'degradation' happening_
_or are we also producing a 'pure sine waveform' to final load, courtesy of Tesla so it's all good_

MC152 [Output Type Autoformer™ Power Output per Channel 150W @ 2, 4 or 8 Ohms] -no DC throughput is advantageous regards to protection but for only two factors including 'load impedance balancing' ?
 
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