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

Tektronix Type 53 /54B wide band Preamp Tube Oscilloscope Test Inst. Plug in

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

Tektronix Type 60 Tube Amplifier Plug In Unit - Untested

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

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

Tektronix Type 3B1 Plug In, Time Base, untested

Tektronix Type CA Dual Trace Calibrated Preamp Plug-In Unit