At the 1997 symposium, there was a special session, chaired by Peter Hobson, to commemorate the 100th anniversary of the discovery of the electron. A "Vacuum Tube History Exhibition" was organized by Don Koijane and John Helmer with the Electronics Museum of the Perham Foundation. This included this 9-foot high, 900 pound Varian Klystron used in an early-warning radar system.