[sdiy] Polivocks opamps

[chopin_o]

>I am ready to do the Barielle Polivocks filter clone.  It specifies a
>Russian kp140ya12 as orignal and as what he says is a working only
>substitutes UA776, MC1776, LM4250.  I can't say I know any of these
>parts very well.  Was given to understand that the UA776 is the best
>replacement.  Anybody build this filter yet ?  Where can I find the
>critical parts in descending order  from  the original Russian.  I
>write and speak Russian so I'm game to order from Russia.

Hi. I'm from Russia, and can help you with 140UD12.
Igor.