So, here it begins! the project : reusing all i can salvage from a broken JCM2000 to make a nice JCM800 2203 I keep the head, the chassis, the OT and PT, and all the rest goes to junk But it's not that simple... Bias : my PT ha a bias tap in form of 25-0-25 V ; so i need to make my own bias board - a 2203 has a 90V bias tap But that should not be too hard. Center tap : my PT has no center tap. So i'll have to wire it like a jcm800 and not a JMP : wich leads to Filtering : i have to drill the chassis to fit the infamous cap cans. I don't like drilling. It's scary. So the less cap cans, the best it is for me. In the original layout 4 cap cans are used in // and series. the 2 first filter caps join at the center tap.. but i have no CT on my PT. And today we can find good 500v capacitors. So can i use only 2 good 100uF 500V cap (or a 50uF 500V cap can) instead of the 4 cap cans ? that would be a relief !