This amp was Inspired by and developed with the help of Gary Smith, the Godfather of South Bay Blues. Gary produced the instructional DVD "Amped Blues Harp Demystified," the seminal work on the topic. The preamp is Octal 6SL7 with 2x 6V6 power and cathode bias for that true Chicago vintage tone. 15 watts with Weber hand-made alnico speaker. Our great sounding Tru-Tone Line Out circuit is included. 230V power circuit is extra cost. Some very distant destinations are extra shipping cost. Up to four weeks lead time.