Tektronix 7B85 Delaying Time Base Plug-in

Tektronix 7B85 Delaying Time Base Plug-In Unit - Works

Tektronix 7B85 Delaying Time Base 7000 Series Oscilloscope Plug-In Module (nice)

Tektronix 7B85 Delaying Time Base Plug-in Module

Tektronix 7B53A 100 MHz dual time base plug-in for 7K series oscilloscopes

Tektronix 7B53A 100 MHz Dual Time Base Module - for 7000 Series Oscilloscopes

Tektronix 7B53A 100 MHz dual time base plug-in for 7K series oscilloscopes

Tektronix 7B71 Delaying Time Base Plug In