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WTB: Balanced tube line stage (diy or not)

Try SY's "Impasse" -- I still have boards for this ($3 in respect of Mr. Yaniger's IP) and the article is now available (free) on the audioxpress website: The ImPasse Preamplifier | audioXpress

(PM if interested in the boards, the link in the article won't work.)

Thank you for the suggestion but as I see its too much gain and intendent for converting single ended to balance for driving F4 monos.