Fisher solid state is not very good but if the unit is working then at $30 you are doing fine. Build up a system around it and when you can get a good deal on something better you should be able to resell it. The better receivers from the 70s would be the Sansui (such as the 9090) or the Pioneer (silver front). Add an outboard DAC to convert your digital sources to analog, and good speakers and you will be way ahead of a cheap package system.