08/23/2026
This bass came in with significant feedback from the neck pickup when in active mode. After extensive inspection of the electronics and grounding, I narrowed my focus to the shielding.
The bass had a combination of copper foil and conductive shielding paint, but the copper shielding did not completely enclose the electronics cavities. In other words, the Faraday cage wasn't complete. I completed the copper shielding, making sure the cavities were properly enclosed and electrically connected. After reinstalling the electronics and firing it up...no more feedback. 🎸
It's a great reminder that proper shielding is an important part of keeping unwanted noise and interference out of an instrument—especially with active electronics and higher-gain preamps.
Another bass back in action! 🔧🎸
A special thanks to Chris at Flippin' Guitars for guidance and advice on the complicated wiring with this Bartonlini preamp.