I have similar problem combined with a poping noise when changing stations. It has been diagnosed as DC voltage leaking out inside the the radio. If not repaired it can damage the speakers. My radio is an Alpine mod. 2194 (Becker look alike). It can be repaired. If you decide to replace it becareful about buying used electronics over the internet. I can PM you about a broken Alpine sold on e-bay listed as being in good working condition.

Scott rnysl320

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Thanks
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1994 SL320