Dear Ken, I ran across your name while searching on the term "Tektronix Bubble Memory Cassette". I am looking for a Tektronix part number 020-1310-00, which is a Bubble Memory module for a Tektronix 370 curve tracer. Since it seems like you did something with Bubble Memory in a previous life, I am wondering if you know what's inside this "cassette" or where I might be able to find one? Best regards, William Benner