Colby Amplification’s Mod Machine is a hand-wired EL34 amp inspired by British amplifiers but capable of multiple sounds and power-amp configurations. It offers a range from clean JTM to “Plexi” to a metal-panel “Master Volume” to higher-gain sounds. The power section includes four modes (Pentode/Triode/Cathode/Fixed) and has corresponding power ratings from 12 to 50 watts or 22 to 100 watts. The all-tube effects loop has send and return level controls, the Master section includes Pre and Post volume controls as well as Presence and Hi Trim. Stage 2 reconfigures the preamp for a tonal shift to a more-modern sound and has its own Gain control. Read more at colbyamps.com.