The Hydra Treble Booster is an adaptation of the Naga Viper, itself based on the Dallas Rangemaster, but with an NPN silicon transistor instead of the PNP germanium of the original.
This kit contains the PCB and all necessary parts. The enclosure can be selected, please select 3 knobs for 6,3mm shaft separately.
Here is the bill of material: bill of material
This project is by Aion Electronics, in collaboration with Musikding. If you have any problems with the contents of the kit, please contact Das Musikding (Klaus). Since the modifications require some basic knowledge, this project is rather for more experienced builders.
Here is the direct link to the manual with layout and schematic: