Vintage Simmons Drums (UK) Users Group

Chiel,
       I don't know for sure if that's the problem but that is what I would 
guess. The SDS-7 exhibits the same behavior. I had two of them, one w/ a 
questionable battery. Once that battery took a snooze it was anybodys guess when the 
"7" would turn back on. I swapped batteries between the two units and the 
problem disappeared until recently. I now have replacement batteries to solder 
onto the PCBs of both units and my two MTMs. I'll let you know how it went.
                                                                              
                 Greg


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