All active with active electronics and 5 boosts the Clapton signature Stratocaster is easily the most powerful guitar in the world. It has 3 cascading 2N6429 transistors that boosts 3 times and discrete op amp topology that boosts 1 time. The last boost is with transistor 2N5087 the smallest boost the mid boost which is the 5 the boost. It has 1 500 volt output which it easily transistor voltage boosts up to 1 600 volts for safety with the help of the discrete op amp topology and the incredibly good condensators. The resistors are the best possible for highest possible boost. Without the mid boost it has 73 Db boost and is 160 times louder than a normal Stratocaster. Thats the way the decibel system works in these extreme levels. Only 7 decibels more 80 Db boost ( 80 decibels more than a normal Stratocaster ) makes it 256 times louder than a normal Stratocaster. The only passive thing in the Clapton signature Stratocaster is its stacked Humbuckers ( vintage Noiceless). A normal Stratocaster has only 0,15 volt output and a normal Gibson les Paul only 0,20 volt output.