Carvin X100B Series IV Tube Amp HeadNotes Includes original 4 button footswitch Recently re tubed with little use since Re tubed with Eurotubes Carvin X100B EL34 ECC803S V1 option kit, which includes a JJ Long Plate ECC803S for V1 for a little lower gain with big thick mids and a little more sparkle in the highs, a standard ECC83S for V2 and a balanced ECC83S for the phase inverter in V3. Power tubes are JJ Electronic E34Ls A Carvin X100B Series IV Tube Amp Head in Excellent condition!