Sun Feb 10, 2013 9:53 pm
Your location says Texas, if you're anywhere along the gulf coast then humidity may be accelerating corrosion buildup on the copper. One thing that can help is to pick up an antioxidant grease for aluminum wiring (any home improvement store, in the electrical aisle), take a light sandpaper to the wires so they shine a bit, then work a little grease into the strands before twisting and reinserting into the spring jack.
The grease is basically to prevent moisture incursion, while containing sacrificial zinc to interact with the atmosphere before the wire does. It's required for old aluminum wiring, but I've also used it for speaker jacks and switch repairs.
Abacus Model 2.5 | Quad-Row FX with 256 Cherry Red Slider Beads | Applewood Frame | Water Cooling by Brita Filtration