I have a groove tubes 67 valve mic that I use in my small home recording studio. I also have a groove tubes 'The Brick' tube mic preamp which I also use as an instrument D.I. The acoustics in my studio are not very good I need to add. I bought the mic on its review with SOS but I am thinking of replacing it with an SM57 to use with the Brick and spend any extra cash from the sale of the GT67 elsewhere. I am hoping that the SM57 will give me a good sound and be more versitile, that will be enhanced by The Brick.