Tektronix Type 3A3 Plug In, differential dual trace plug-in, untested

UNTESTED Tektronix Type L Plug-In Unit Fast-Rise Calibrated Preamp ~ Made in USA

Tektronix Type 1A2 Plug-in - Dual Trace for Oscilloscope 500 Series

Tektronix Type 3B1 Plug In, Time Base, untested

Tektronix Type CA Dual-Trace Calibrated Preamp Plug-In W/Manual

02 TEKTRONIX ORR24 OPTICAL REFERENCE RECEIVER SONET SDH

tektronix type 53 / 54D high gain preamp plug-in untested

Tektronix Type W SAMPLING Unit For 500 Series Oscilloscope