5A24N
The Tektronix 5A24 is an amplifier plug-in for 5000-series scopes. The deflection range is 50mV/div to 1V/div. The maximum bandwidth is 2MHz. The 5A24 contains an area on its printed circuit board that has empty solder pads. The user can add custom circuitry that accesses the input signal, output to scope, and power rails. It is the least expensive plug-in Tektronix ever made: US$25 in the 1973 catalog.
