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

Tektronix 7B87 Time Base Plug-In Unit - Works

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

Tektronix Type CA Dual Trace Calibrated Preamp Plug-In Unit

Tektronix Type M plug-in unit Tested Works

TEKTRONIX 7A13 DIFFERENTIAL COMPARATOR W/ ORG. MANUAL PLUG IN TESTED WORKING

Tektronix Type 60 Tube Amplifier Plug In Unit - Untested

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