Peavey Electric guitar Owner's Manual page 11

Strings
Old strings produce dull, buzzing or dead notes, while a
new set of strings ring clear and true. If you play often,
you will need to change your strings often. A good rule of
thumb is that if you play daily, you should change strings
every two or three weeks. Replace your strings as you notice
them becoming dirty or discolored, before you experience a
disappointing loss of performance.
See page 12 for detailed instructions on changing strings.
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