MOD 102 DIY Guitar Amplifier Kit The MOD 102 is a great place to start for those interested in building their own tube amp. It is based on a classic American tube circuit design combined with a British style Class A output tube section. At low volume it produces a clean chimey tone that moves into smooth overdrive at higher volumes. All parts are included along with a pre-drilled aluminum chassis, wire and tubes (1 EL84 and 1 12AX7). The chassis layout is open for easy assembly using the clear, easy to follow instructions. You will need your own tools and solder.