A question about diamond buffers

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Hello everyone,

Recently (since this morning actually) I got very interested in diamond buffers and found several schematics. I understand the principle for the Walt Jung version and some derived ones but not this one for which I post the schematic. I may be a dumb question but how is the second stage correctly polarised? To me it looks like a class B or even C stage... Probably I'm missing something in the design...
 

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