NAMM '19 - Ruokangas Valvebucker Demo Shawn HammondJanuary 29, 2019VideoFinnish luthier Juha Ruokangas shares the fascinating origin story of his active pickup system driven by onboard NOS tubes. namm-2019whats-newvideost-stylegear-show-demoruokangas-guitarspickups-accessoriesguitarsspecial-featured-storiesgearGearElectric GuitarsPickup ReviewsNAMMVideosReviewsAccessories