For the best amp tube for mids, take a look at the EL34. These amp tubes deliver the best in mids and the upper ranges of the mids. Designed in England, they offer a smooth sound and plenty of note separation as well. Not only that, but you’ll get a complex harmonic. This will impress no matter what style of music you play. It also offers the velvety sound commonly heard in opera and classical music. The KT77 is focused on the bottom end. This means high-end harmonics and a dark sound. You’ll also have a lot of drive to it and an open aspect. All of this creates on-demand heaviness and a full-sizzle tone for contemporary sound and any volume.