Bought from Japan as a project but just have no time to get around to it. Previous owner in Japan really souped up this amp by putting what appears to be an 50s output transformer from a Hashimoto Single-Ended Power amplifier. These OT's go for over $400US alone so you could either use this for your single ended audio tube amp or leave it in this amp to give your guitar some clean sounds. The original amp had four 6" speakers in it but the previous owner turned it into a head. No tubes included.