As a new member, I was encouraged to buy a Maverick Audio TubeMagic D1 from reading all of the positive comments on the site...but a few things caused me to return the unit.   FIrst, which was my own fault, on receipt of the unit, I realized that the tube output is not connected to the headphone output - the tube stage is only valid for preamp use.  I was hoping that like their other product, a product called Tube Magic would support tube output to my K701s.  It didn't.  Users expecting to use this as a dedicated headphone amp will not need the...