ST900 Sans Tube

This is the whole boost channel preamp from the “900” amp that is loved by many people. We replaced the preamp tube with a jfet. Its a 900 without the tube, hence the “sans tube” 900 as the name of the pedal. We kept in the 3 band eq from the 900 amp. This goes from very low crunch to searing high gain. It chugs very nicely and pinch harmonics fly off the fingerboard. Lower gain settings gives you classic Malcolm Young tones, and higher gain settings gives you Angus in full flight. GAIN controls the amount of dirt, BASS is 60Hz, MID is 400Hz, TREble is 4hKz, VOL is the master volume for the dirty signal. The RED LED indicates the effect is ON. The 3 band eq is an “amp style” eq, so start with all eq controls on maximum and bring them down as desired. Mozztronics uses the industry standard Boss style 2.1mm center negative 9V DC socket for the power supply connection.