Tektronix DP501 Digital Prescaler Plug In Module for the TM500 System

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

Tektronix 7D11 Digital Delay Plug-in Module - Tested for Power

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

C1 - Tektronix TM504 Power Module, 4 bay, TESTED Working

EG&G ORTEC 419 Precision Pulse Generator NIM Module Untested As-Is

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