Chops54
pfm Member
I gave my son a 3A preamp years ago and I thought he would have been done with it by now but he still has it and asked me to service it. The main issue I think is that it's a bit noisy due to the quad N channel mosfets it uses. I can't find any sort of replacement for these ( ZVN4206E) but I did read of someone replacing theirs with four individual 2SK170s. It worked, the noise had gone but there were some instability issues. Can anyone suggest something that might do the job?