[Arran]

From what I have heard you need to be careful with a lot of those early solid state tuners, the AM side is usually fine but the germanium transistors in the FM section can become unstable over time. Even the power output ones can become unstable and noisy. In fact the earlier transistors were unreliable at higher frequencies which was likely why Fisher made this set with a tube front end for the FM side and why RCA developed the Nuvistor series of tubes for their TV tuners.
Regards
Arran