I build the xaltra preamp and i whant to understand the benefits using this type of dc offset adjust in input fet gate. Looking in similar preamps like onkyo p3060,sansui ca-f1 i observe that biassing is diffrent. Personaly i try the below method (sansui) and is work.
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BTW there is a new X-Altra Mini II Line level preamp coming soon. Much, much easier (and cheaper) to assemble but with the same specifications and facilities
https://hifisonix.com/news/x-altra-mini-ii-big-board/
https://hifisonix.com/news/x-altra-mini-ii-big-board/
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