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

Tektronix Type D Plug In Unit High Gain Works

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

Tektronix 7S11 Sampling Unit with S-4 Sampling Head Tested

Tektronix Type D Plug In Unit High Gain Works

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

Tektronix TR503 Tracking Generator Plug-in for the TM500 System, 0.1 to 1800 MHz

Tektronix Type 3B3 Plug-in - Time Base for Oscilloscope 564 w/ Manual