With a simple, clean design this Elekit TU-879S single-ended, class-A vacuum tube amplifier kit echoes past greats like the Japanese made Audio Note Ongaku. Supplied with EH 6L6 tubes, this versatile amplifier is able to handle just about any octal based power tube on the current production market. We have tried it with JJ KT77, EH 6L6, Sovtek 6550 and SED KT88. They all sound great, but we favor the SED KT88 for its robust power and overall balanced tone. With the easy to follow instruction manual, in just a few nights, you can be listening to some of the best audio you can imagine.