Different Ref. Voltage Creating in Compl. Cascode VAS Stages of Power Amps-Pros/Cons

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Different Reference Voltage Creating in Complementary Cascode VAS Stages of Power Amplifiers

There are many power amps with VAS cascode stages. The reference voltage creating therefore is often different - I know two versions.

One version you can see here:
http://www.audiofanatic.it/Schemi/Tipo/Stato_solido/finali/pic_finaliSS/70W_MOS_2SK135_2SJ50.jpg
http://www.audiolink.com.br/audiolink/imagens/minicrescendo_2.jpg
https://www.mikrocontroller.net/attachment/119393/mos_100_2.JPG

and an other version is on post 25 (first jpg) under
Omtec Mono Power Amplifier "CA 25" (CA25) - Schematic wanted

What are the pros and cons of both ?
Maybe in detail described anythere here on the forum or in one of this books:
http://www.diyaudio.com/forums/pass...mplifier-design-except-class.html#post5296015
The best audio amplifier books - Overview (Google books)

Thank you for advices
 
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