My first visit to the museum of magnetic recording was a terrific experience. I came to see Martin Theophilus who lives down to Austin Texas. Martin spent few hours of his precious time to guide me though his house which is a functional museum. All recorders are well maintained, and accompanied by numerous of historical documents, old advertisements, microphones and other items of the time period.
One thing he and I certainly have in common is that we are short on space. I was laughing to see tape recorders near his shower! One of my favorite pieces was his Ampex 200, it did really knock me out!!
I got plenty of information about magnetic recording from him. I also acquired few items that I saw in his collection. I have a feeling that number of tape recorders in any collection doesn't really matter. Most important is quality, care, and the love given to the collection. The rarity of items is also very important. Martin definitely has unique collection. strongly recommend to support his efforts to preserve these fantastic machines.
You can see the museum of magnetic sound recording at http://museumofmagneticsoundrecording.org/