Dec 27, 2017· Orange Crush 20RT Guitar Combo Amplifier with Reverb (20 watts, 1x8") Building on the power and versatility of the Orange Crush 20, the 20RT also features lush reverb for huge soundscapes plus a handy on-board chromatic tuner. Overview -. The Orange Crush 20RT amplifier builds on Crush 20's twin channel tonal platform and feature layout with ...