After restoring my Fender Eighty-Five, I thought the hardest part of the project was over. I was wrong.
When I reassembled the amp, the original 12-inch speaker cone detached from the back, possibly the glue had dried out, the part containing the electronics, accidentally fell onto the cone while I was mounting it. What looked like a small repair quickly turned into an unexpected adventure in speaker surgery and cabinet building.
I tried to realign it manually, but there was a problem, the magnet was incredibly strong and the tolerances inside the gap were extremely tight, so keeping the coil centered while tightening everything was practically impossible by hand.
Instead of fighting the magnet, I designed and 3D-printed a custom centering frame, sized precisely to fit inside the magnet opening. The frame kept the voice coil perfectly aligned without touching it.
Also I've not used the original back steel cause it was to tight, I know using something with greater gap will give me slightly less volume, but it was the only way.
The repair turned out solid. And most importantly: it sounds clean, and punchy again, not as it was in the past, but good enough for me.
For the Fender Eighty-Five my friend buy a new speaker, this one I will use for another project.
Notes
- read risk disclaimer
- excuse my bad english