Dean Markley K-150 gitarrförstärkare

Dean Markley K-150 guitar amplifier. This amplifier has controls for Drive, Volume, Treble, Middle, Bass and Reverb. It has inputs for Input, Footswitch, Phones, Line Out and Line In. Made in USA. Hello The amplifier worked perfectly four years ago but now that it has not been used for such a long time, it crackles terribly and needs to be looked at. Note: it works and is not broken.