Hi there everyone.

I'm a music producer in the early stages of my career. I have always been a musician first, but have become much more focused on engineering over the last few years.

I spend a lot of time researching and finding old bits of analoge equipment and figuring out a use for them, and this has lead me to become interested in modifying some of this equipment, however, im a unsure of where exactly to start with this.

i have some very very basic electrical experience in fixing my guitars, changing pick-ups, and i have converted an old telephone handset into a microphone, but nothing beyond this very basic level. when i get to a circuit board i am pretty much lost.

i wanted to see if anyone here had some advice on where i can begin to learn some of the basics of circuitry that could be useful in the modification of music gear? or even better, if anyone knew of some common beginner modifications to tape decks or really any commonly available piece of music equipment they would recommend for a beginner?
any advice is welcome as this is a new world to me
thanks for reading anyway!