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The Keeley K201 JFET Booster Amplifier is really the Katana Boost with one less feature; it has no pull switch! With a top mounted volume control it answers many players request for the ultimate Keeley Boost. John Mayer has used the Keeley Katana for years with his rig. His sound is instantly recognizable and really gorgeous. Rene Martinez (SRV’s tech) swears by them. This is the same exact circuit as in our standard Katana just without the pull switch for distortion.