Tektronix Type M plug-in unit Tested Works

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

1967 Tektronix Type O Plug-In Operational Amplifier 8 Tubes! For Tektronix 547

VINTAGE Tektronix Type 1A1 Dual-Trace Plug-In Unit

Tektronix Type D Plug In Unit High Gain Works

Tektronix Type CA Dual Trace Calibrated Preamp Plug-In Unit

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

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