Philips AG9015 - interesting output stage

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El Sid

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So I spotted this Philps AG9015 amp for sale in a radiogram: https://www.avforums.co.za/index.php/topic,8971.msg1044072.html#msg1044072

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Took a bit of searching to find it - there are a few similar models, some of which are output transformerless. So I looked around more and saw they can have OPTs, but examining the schematic shows an interesting output stage topology. Discuss for 25 marks.

ctbKtlF.png


The OPTs are quite weird-looking things:

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Full circuit:

9xiaFr8.png
 
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