I like Amperex USN-CEP 7308's in my Audioprism Mantissa preamp...not a tube for someone that wants lots of bloom though so you may want to state your goals for your system...and of course your price range.
i use siemens gold pins e88cc in my sonic frontiers line3.i tried some mullard with very regular performances.the sovtek are a goog compromise for the price.valvo are also expensive but in my opinion dont beat the siemens.
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