I found this online...
"clean all the input and output jacks, as well as some internal pin connections, with DeOxit, my favorite contact cleaner, and treated them all with PreservIt, my favorite contact preservative. These removed the oxide from the connectors (metal oxides are great, nonlinear rectifiers). Incidentally, while I said I wouldn’t say much about guitar electronics here, I will note that the DeOxit/ PreservIt treatment works wonders at getting radio stations out of stomp boxes."
and
"If your amp is picking up radio station it means that the amp is not "immunne" to RF. This often signifies a poor design. It can come from the input line or from the speaker cables or even through the chassis. I would look for poor grounding or a problem with the source power. Chasing down the source can be a real bear. An AC line conditioner may be the most effective tool to combat this problem. If not, you have a proximity problem in which case short speaker cables and even dual amps are the only real solution. Try switching out amps in a location where you are having this problem.
If you are tying spare ground cables between equipment (which is a good idea for power systems) use a very heavy braided cable terminated very well (star washers). Ground cables depend on surface area to fight RF. Small ground cables (18-16awg) still have "resistance" to high frequncies. Any length of wire, regarless of termination, acts like an antenna.
When I have to deal with this kind of problem in my daily work, that being design of electronic enclosures, shielding the chassis and grounding are my first go-to and second, I evaluate the transformers being used in the circuits. Believe it or not, there are a world of differences in the new fangled transformer designs coming out today. Form factor is not everything. The old style transformers made with many shims of iron are much better to saturate the core than the one piece ferrite cores made for manufacturing ease and challenging form factors."
good luck!
- Nic from Detroit...
posting on JB's Forum since 6-2-2006Ask me about my handwound
Great Lakes Guitar Pickups Since 2010, Bonamassa fans have taken advantage of my JB friend discount = my cost + shipping.
"