Available as an assembled Module and as a DIY project.
This Module is currently available.
Dual preamp module
Inamp is a dual pre-amp in just 4 HPs. Featuring 6,3 Jacks inputs as well as Minijacks.
The unit is designed to amplify up to x20 the input signal, allowing to amplify most of the music machines out there (Domestic line levels) as well as some guitars (Humbucker-like pickups and so).
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These merchants probably sell this module. Huh?