Vintage Tektronix Type CA Plug-In Unit - Dual-Trace Calibrated Preamp

Vintage Tektronix Type 1A1 Dual-Trace Plug-In Unit #A - as/is

Vintage Tektronix Type 1A1 Dual-Trace Plug-In Unit #B

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

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

Tektronix 7A18 Dual Trace Amplifier Plug-In Module 75MHz w/ opcion 6

Tektronix 7A26 Dual Trace Amplifier Vertical Plug-in for 7000-series scop

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