Just got the EF2 and am seriously in love with it! Its my first amp (not including Fiio E5). Of course I am already itching to start rolling tubes with it, but have no idea what tubes are considered as good starts (in terms of which tubes are believed to have which characteristics) as well as no...

I am new to the forums and was wondering if it is possible or worth it to use a M-audio Sonica as a dac to an amp from my laptop? Thanks