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CARVIN VINTAGE 33, the reverb is malfunctioning

Hello, Having a problem with my carvin vintage 33:  The reverb is malfunctioning in that turning it up past 1 results in a terrible screeching sound. 
The amp works fine otherwise.  I power it with a 220v step down transformer as I live in Cebu City, PH and I purchase the amp in America. 
Any advice welcomed.  Thanks