The waste heat generated in the housing is discharged to the environment in a highly effective manner via new, external cooling ribs. Thus, the SG generator can be operated without restrictions both in damp rooms and in the open air. In combination with a fully water-tight immersible transducer, the generator provides a heavy duty retrofit solution for existing cleaning baths. The customer-tailored transducers are attached to the side walls or the bottom of a tub and supply the entire tub with an intensively cleaning cavitation field. The maximum ultrasonic power per generator is 1,500 watts.