Ok, so I have a Vox AC4TV head that is making a wooshing/crackling/occasional popping sound that increases with increased volume. I’ve tried new tubes and cleaned pots, so that’s all I know to do besides taking the plunge into troubleshooting and replacing components. I know this is probably a tough endeavor for my first true electronics repair, but it’s the simplest and least invested item I own so I’m going to go for it. Where do I begin to make sense of the schematic vs the component lay out? I don’t care how long it takes for me to learn, just looking for advice on how to begin and what resources to utilize. Thanks for taking the time to help this noob.