I’m curious what the first thing was that people swapped out, because mine was embarrassingly simple: the output jack.
The jack on my first kit build (an ST-style with a recessed barrel jack) was loose within a week. I hadn’t installed it particularly well but the quality of the component wasn’t helping either. I replaced it and it’s been solid for two years. Total cost was a few dollars and maybe 15 minutes of work. It didn’t change the tone but it fixed an intermittent crackle that was driving me crazy.
After that I got more systematic about what actually makes a difference and what’s mostly in your head.
Pots are one of the first things worth upgrading on builds that come with mini or low-quality pots. The physical taper (how the volume changes as you rotate the knob) is different between cheap pots and quality audio-taper pots, and the tracking consistency matters if you’re doing any kind of volume-roll-off playing. I switched to 500k audio taper on my single cutaway humbucker build and the difference in how the volume control sweeps was immediately obvious.
Capacitors are more debated. I’ve tried ceramic disc caps, orange drops, and a couple of boutique film capacitors. Honest answer: the differences are subtle at best. The cap value (0.022uF vs 0.047uF) makes a bigger difference than the cap type. Smaller values keep more high end when you roll the tone down. Larger values get darker faster. If you’re going to upgrade caps, upgrade the value first and see if you like it before spending money on exotic components.
Locking tuners were the upgrade that made the biggest practical difference to my daily use. No more winding multiple wraps around the post, restringing takes a fraction of the time, and tuning stability improved meaningfully on bending-heavy playing.
The plastic nut to bone nut swap is worth doing on any build you’re going to keep. It’s more work because you have to fit the blank yourself (nut slots are not universal), but sustain on open strings improves and tuning stability improves.
What was the first component you upgraded on a kit build, and what specifically prompted you to make the change?
Did the upgrade make the difference you expected, or did you find the improvement was somewhere else in the chain?
Is there an upgrade you’ve tried that turned out to be not worth the cost or effort?