For sale is a great condition Grant Fidelity Tube-Dac 11. This wonderful DAC also function as a pre-amp and tube pre-amp. I feel the tube pre-amp is where this DAC really stands out as it's possible to roll in the ideal sound for your system. It uses the 6DJ8 and it's equivalent: 6N1P, E88CC, ECC88, et al... so many options out there. I'll include some additional tubes: stock tube, A-Frame Amperex, Halo-getter Amperex, and Russian 6N1P.