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I have a perfectly working Graupner Ultra Duo plus 50 charger, except for the means of selecting the battery memory (from 1 to 50). That is done via a red knob in the middle of the charger and it is the potentiometer with push button switch that is faulty. I can turn the dial clockwise, but nothing happens, so I guess it is a potentiometer with a dirty contact. I have opened up the charger, but cannot see any markings on the pot I have tried to contact Graupner Germany and in the UK but the response was not helpful, neither came back with the promised info. I am looking for the type of potentiometer and ideally a part number and supplier. Does anyone have a circuit diagram, or any info? I was told that the failure of this input device is / was a common problem with the Duo 50 and it looks to me like the current model Ultra Duo plus 60 has the same selection method, so perhaps the same pot and the same fault? Graupner may want me to buy new, but at £ 350 it will not likely be Graupner! I will be grateful for any suggestion. Thanks, Bert
