Just saw this thread. Until not long ago I had a 600T receiver. It was their first ss receiver. Actually, it is a hybrid that uses the fm front end from the 500c tuner along with all else in the tuner being ss. The tuner is receiver coupled to a ss amp.
The receiver combined the first ss tuner, again a hybrid tube and ss, the TFM300 along with the TX300 amp. I also had a set of these. They all needed work and I did nlt want to pop the germanium transistors so, I had little play rime on them but, they showed they could easily strut with the best. These were amazingly built. Seemed like no expense spared. Inside they were every bit as good and even better than the McIntosh from that period. The chassis was old world design, a carry over from tube days. The faceplate and backplate were not the cheap plated thin stuff but cast and tapped for screws. The gold trim like the Sherwoods was real gold plate unlike most who used goldtone. While I liked the looks of the tube Sherwood over the tube Fisher it was a far different outcome comparing these to the 1st gen Sherwood ss amp and tuner, the S3300 and S9500c. I use these as my main units currently. I did have a chance to compare the Fishers and Sherwood. They could have overlapped on the dealers' shelves as the Sherwood came out just about the Fishers were being withdrawn.
As for sound, the Sherwood had been gone through and are healthy. The Fishers were in need of lots of tlc. And we compared germanium to ss designs. The Fishers did well enough that after being gone through by a competent tech, they might be as good or even better. And this is coming from a confirmed Sherwood guy whose little amp and tuner moved big stuff like McIntosh out of the house.
I shelved the three Fishers before getting sick but after decided I never would get them done so sold the receiver to a guy who was just getting into vintage and knew his way under the hood of a 600T. He had just finished one for a customer and was looking flr another for himself; he was that impressed. The tuner and amp went to the gent who bought the McIntosh system from me.