My current D/A converter is an asus xonar essence stx(Sound card). I would like to upgrade to a Benchmark DAC1. It would then go throught a little dot mk3 (upgraded tubes m8161 &m8100) with a apir of AKG K702. My question is: Should I keep my current D/A or should I invest 600$ for a Benchmark...

       Allright, I found many different types of tubes (100+) at my grandfauther's, however none were EF95.EF92,EF91. So I decided to look up each 6v tube's specs and found a few with the same pin configuration. I even found 2 octodes that would work! I tested ALL the potentialy fatal tubes on...