Check the listing for details. Boss Nextone Stage 1x12" 40-watt Combo Amp. Condition: New. Listed at 549.99 USD. The Next Step in Power Tube Modeling Technology From the focused punch of an American 6L6 to the juicy sag of a British EL84, power tubes play an important part in an amplifier's signature tone and response. And with the BOSS Nextone Stage, capturing the magic of four major output tube types is as easy as twisting a dial. This 2-channel, 40-watt 1 x 12" combo features the latest iteration of BOSS's Tube Logic technology — the same building blocks from which BOSS's Katana and Blues Cube lines were built. In the Nextone Stage, every choice of output tube re-voices the entire circuit to perform more like your favorite classics. Breakup and bias, sparkle and sag — every type imparts its own characteristics, giving you cranked-up tube glory at bedroom listening levels.