did you fired it up according to post http://www.diyaudio.rs/topic/1765-semisouth-power-jfets-fw-j2/page__view__findpost__p__51840 ?anyway - we can test it easy ;for easy testing , it's best to have outout jfets connected to pcbs with short wiresfirst step - unsolder both output jfets from pcb , and let me know what's Ugs for lower and same for upperthen I'll calc and tell you on which values you need to set every trimpotthen we'll test just front end and few other pieces - without output jfets in circuit