Hello Jeff and all:
Reading and researching through the voluminous volumes from the vault of F_minor, I came across a similar inquiry as to the tape recorder(s) GG might have used for his radio documentaries - what was mentioned were the Nagra recorders (considered to be one of the top recorders)
see link below http://www.filmsoundsweden.se/backspegel/kudelski.html for a particular portable model - although I don't know if GG used this particular model (I would suspect he would use the "best").
Also, see the YouTube clip: http://www.youtube.com/watch?v=Yxe9xRGfboA
In a message dated 08/09/09 16:56:25 Central Daylight Time, firstname.lastname@example.org writes: