Tektronix Mode: 11A72 Two Channel Amplifier.

Vintage Tektronix Oscilloscope Plug In Module ~ 11A52 Two Channel Amplifier

Vintage Tektronix Oscilloscope Plug In Module ~ 11A32 Two Channel Amp

Tektronix 11A33 Differential Comparator, DC to 150 MHz Bandwidth Plug-In Module

Vintage Tektronix Oscilloscope Plug In Module ~ 11A34V Four Channel Video Amp

3EE Tektronix 11A33 150-MHz Differential Comparator Amplifier

Vintage Tektronix Oscilloscope Plug In Module ~ 11A72 Two Channel Amplifier

Tektronix 7A13 Differential Comparator