dc jack 2.1 mm k 5.5mm 9vdc to 18vdc -negative LLL lal Tutelage] circuit } remove four screws from the bottom plate to access [LE ELL GIRO [Lil Tr yer output Jack true bypass on/off switch y input jack (nominal Input -bedbug) unplug when not in use for a longer battery life About: RL a TO The BB Preamble offers a wide variety of sounds.