JFET-Vulcan – Build Instructions [featured_image] JFET-Vulcan - Build Instructions Download is available until [expire_date] Version Download 822 File Size 456.37 KB File Count 1 Create Date 10 July, 2015 Last Updated 11 May, 2026 JFET-Vulcan - Build Instructions Headphone Amp incl. Stereo Simulation – Build Instructions PControl V2.1 – Build Instructions