EL 34 vs. KT 88 ---- What's the difference?

for many it boils down to bass, more bass, less bass, etc. bass, bass, bass. the 6550 and KT*** tubes offer a darker, more mellow sound; more bass. The 6550, kt120 and kt150 tubes do give off a lot of heat. very hot. the el34 tubes are more lush, and musical. the midrange is great. but- the Tungsol EL34B tubes give a punch to the bass. also Gold Lion gold pin 12at7 tubes help with bass, and Tungsol gold pin 12ax7 tubes add a bit to the upper frequencies. Get an amp without tubes. Buy your own. I sell Black Ice Audio gear (Jolida Audio). I have used different tubes. There is nearly as many opinions about tubes as there are different tubes. The tubes I mention represent excellent value, and reliability. In the Fusion 3502S amp I prefer the EL34 tubes to the 6550 tubes. (like the JD302CRC amp)