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great project! i really like the idea of a passive preamp, i'll try it for sure, btw as you stated steps are not even between them, that's pretty usual with those ladders, you need to have resistors with ideal values, and if i'm not wrong the resistors you used are > 1% tolerance, you'd better go with something more precise, maybe 0,1%still a great project, and awesome diy pcb (your first project was more messy for sure)
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