I installed a NuTone Trasnsitor Radio Intercom Music System, Wall Box Model 2560A, in my new house in 1970. I have intercoms in every room. The master gets very poor reception, the volume control doesn't work properly, and I can't tune the stations correctly. Is there currently a master model that will fit the space in the wall so that I can replace this one? I cannot find anyone who can repair the old one. If so, please give me a quote as to the cost. If not, what is your suggestion as to locating someone who can repair one that is almost 35 years old? Thank you. Jim Eckert

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