Part of interviewing great people is that you get more tape than you can use.
For the last episode of the season, Matt turned up an old family tape; a cassette his grandfather recorded in the 1990s of older family recordings dating back as far 1951! It is incredibly rare to have home-recorded audio from that long ago.
The 1951 recording was made on dictabelt
One of many intermediary technologies between the invention of the wax cylinder and the proliferation of reel-to-reel tape.