Accuracy,you say? hmm interesting concept..
View post (tone pot making scratchy sound)
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Either get some electrical contact cleaner and clean inside the pot, or get a new one note down the value it'll say something like "A 250k". take it to a music store or electrical supply (radio shack) or call and ask if they've got one. remember what goes where and re solder it Well effective. Sorted my amp out this way.