Tektronix Type L Fast Rise Preamp Tube Vintage Oscilloscope Test Inst. Plug in

Tektronix Type CA Dual Trace Calibrated Preamp Plug-In Unit

Tektronix Type 60 Tube Amplifier Plug In Unit - Untested

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

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

Tektronix Oscilloscope Plugin Module SI-5010 Programmable Scanner

Tektronix Type 3B1 Plug In, Time Base, untested

TEKTRONIX TYPE 3B3 TIME BASE PLUG-IN MODULE As Is Untested