The CUB12R offers a CUB with substantially bigger bites and a nifty trick up their sleeves! All will be revealed in a moment. The CUB12R houses a 12" driver, giving them an increased volume and full rich valve tone. Looking at the preamp it's clear that the CUB12R packs more into the amp than it's smaller siblings. From right to left the controls run as follows: -Gain, Treble, Middle, Bass, Volume, Tone and finally Reverb. The output section of the CUB12R is based around a pair of EL84 tubes giving it a more scooped tone than it's smaller counterparts. Think smooth rich overdrive with bags of gain.