Home › Forums › GuitarPCB Build Support › plexi plus bias (answered) This topic contains 4 replies, has 3 voices, and was last updated by Barry 5 days, 10 hours ago. Viewing 5 posts - 1 through 5 (of 5 total) Author Posts April 15, 2019 at 6:19 pm #5242 koutekParticipant Hello I finish to build plexi + tone tweq, how can I set the trimmer of q1 q2 q5 which voltage? can someone explain me how can I check with multimeter? thanks Angelo April 15, 2019 at 6:50 pm #5243 wilkie1Moderator RTFM. Read the fabulous Build Document. Page 2 of the document gives specific instructions on how to bias the transistors. April 15, 2019 at 8:14 pm #5244 BarryKeymaster In case you actually do not know where to put the DMM probes to get voltages read page 8 of the Crash Course Guide found on our Guides Page. April 16, 2019 at 3:30 am #5248 koutekParticipant thanks Barry, should I read approx 5V on drain q1-q2-q5 right? April 16, 2019 at 3:34 am #5249 BarryKeymaster Yes or half the supply voltage. Author Posts Viewing 5 posts - 1 through 5 (of 5 total) You must be logged in to reply to this topic.