Pictures first Sounds great for its size but the EQ kind of sucks in my opinion. I was expecting controls that behaved more like Presence and Resonance controls but, they don't. If I were to describe it, I would say the Bass and Treble knobs behave more like an 2 band graphic EQ. Which I guess I probably should have expected. The Mosvalve sounds much closer to a full size tube poweramp and to me the presence control behaves exactly like the presence control on my old 6505. I would keep this little guy if I really needed a portable setup but, I'd rather just return it and put the money into repairing channel B of the Mosvlave.