1964 Mercury M-12a noise

[journeyman]

My amp tech did a couple of things to get my old Jet running quietly. Of course we replaced the filter cap can, but then he reconfigured the daisychained grounding so that there are now two separate points of contact. That helped a little bit, but then he added a tiny bit of filtering. To counter any potential stiffness caused by the additional filtering, he reduced the amount of negative feedback. I'm very happy with the amp now; it runs very quietly and is very responsive.

I used my M-12 on the weekend with a stereo jack and it sounded amazing. Good luck with yours; it'll be worth the effort to get it running the way you want.