The CUB-HEAD houses three ECC83's in its preamp and two EL84's in the power amp section, all hand selected to give the best valve tone possible. It has two input options, one giving you 15 W of tube tone, the other giving you a huge tube sound but cutting the output down to .75 W. The rear panel of the CUB-HEAD houses two speaker out sockets in 8 and 16 ohm options, a footswitch socket for switching the reverb and an effects loop consisting of a Send/Line out socket and a return socket.