This is kind of a "part 2" to a previous thread I started last month. I recently got a Tonemaster 214 in a trade. I put in a 3 prong cord, removed the death cap, and replaced the filter cap can with a new one from CE Manufacturing. When I got the amp, it had some static/crackling and I was hoping that replacing the electrolytics would help but unfortunately it has not. When I got the amp, it had the original Telefunken 12AX7s, GE 12AU7, Sylvania 6V6s, and GE 5Y3. I thought I had some of the static/crackling isolated to the 12AU7 so I replaced it with a NOS GE tube but it really didn't help any. I've swapped around all of the tubes with ones from other amps and the crackling is still there. Here's a video. I've cleaned the tube sockets but that hasn't helped any. Is there a "right" way to troubleshoot an annoyance like this?