Rega Brio-R design

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Does anyone know what the late 1960s design feature is "reinvented" in the Brio-R?
The spec looks fairly normal with moderate distortion, so to me the candidates are:
1) Output triples and single ended error amplifier ie an updated Quad303
2) That is when the so called Baxendale diode appeared, so maybe a quasi-comp.

The marketing talks about Class A driver and AB output, but that applies to almost anything
 
I would like very much to see the schematic of it, in order to understand what the hype is all about... apparently they've just dropped the CFP output stage of the old "Texan" design for a Darlington pair (Sanken STD03N/STD03P) with an EF as driver. At first thought, one could assume a Triple Darlington arrangement, but I seriously doubt that...

Can anyone shed some more light?
 
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