The next change I made was swapping out the coupling caps for Mundorf Zn 2.2 uF.
The Zns are now Allen Wright's preferred coupling caps:http://db.audioasylum.com/cgi/m.mpl?...rf&r=&session=
Thorsten put the 2.2s in his new Abbingdon Music Research player, also.
This cap upgrade has now broken in and it is really good.
The combination of these two changes unleashed an incredible DAC.
Bimmer116: Make these two simple changes, add a good pair of tubes, and you'll get the highs and detail you desire.
My next mod is to convert the B+ power filtering to choke input from CRC. I want to do some power filtering simulations first to help find optimum values. Ruach, did you do any simulations before adding in your choke?
After that maybe change the B+ rectification to Hexfreds.