Samurai Boost - Keeley Katana Boost Clone PCB. Compares to:Keeley Katana Boost Clone. TheSamurai Boost is our take on theKeeley Katana Boost Clone. The original used a push/pull switch but we've moved this to a toggle for ease for the diyerand it even fits in a 1590A/Gorva M45 if you're feeling it!