I Have a GE stereo & i bought a portafy system to go along with it so I could listen remotely on a speker but I misplaced the sending part of the system. Does anyone know where I could find a replacement ? I purchased the system about 1973 so I know they will be hard to find. I still play the stereo & it workes fine & I have 2 remote speakers for the remote system. Thanks in Advance.