The circuit presented by Cor Van Rij for characterizing JFETs is a clever solution. Noteworthy is the use of a five-pin test socket wired to accommodate all of the possible JFET pinout arrangements.

A functional replacement for Toshiba’s discontinued 2SK389 low-noise dual JFET is available from Linear Integrated Systems, which devotes itself to specialty semiconductors. In fact, the LSK389 series ...