Controls include Volume, Bass, Treble, Brilliance, and Master Volume. Optional Reverb makes this amp truly versatile. A pair of EL34 tubes make up the power section. An effects loop simplifies performance set-up. You will instantly notice why this work-horse is the top choice of pro touring Blues, Jazz and Rock artists around the world including Robert Cray. The Clubman can be matched to any Matchless extension cabinet but is most frequently paired with the Matchless ESD.