Here is a perfect example of what designers or even a hobbyists need to consider when placing circuits into metal enclosures. The picture shows a resistor that has been rubbing against the metal chassis inside a Vox amplifier. This resistor was part of the input circuit for the amp. The owner of the amp was experiencing buzzing and cutout of his guitar while playing. He would then adjust his cord going into the amp to releave the symptom. What he was actually doing was slightly moving the resistor away from the metal chassis. The process of plugging and unplugging the cable and moving it around on worsened the situation. All that needed to be done was simply bend the resistor down so that it was no longer touching the metal chassis. One thing to remember, if the resistor has been rubbing for awhile is maybe possible that the resistance had been changed. So I made sure to check it with an ohm meter just to be sure.
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