Mid East Thmp Thumb Piano with Spruce Top Distortion Regulated linear power supply with

Regulated linear power supply with custom wound toroidal transformer

From there

All models in the Custom Series offer a switchable 8/16 ohm output jack for powering an external speaker cabinet when you need to speak with a little more authority

elevate this design to a new level of performance

an XLR output with selectable levels

Mid East Thmp Thumb Piano with Spruce Top Distortion Regulated linear power supply withThe thumb piano originates in Africa. It is also known as the mbira or likembe. The metal keys are mounted on a wooden box that acts as the resonating chamber. The longer keys have lower pitches and shorter keys have higher pitches. The keys can be adjusted by tapping them in or out to adjust their length, and therefore their pitch.