Tektronix 7B80 Time Base Plug in for 7000 Oscilloscopes

Tektronix 7B85 Delaying Time Base Plug-In Module for 7000 Series Oscilloscope

Tektronix 7B53AN Plug-In Module Dual Time Base for 7000 Series Oscilloscopes

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

Tektronix 7B80 Time Base Module - for 7000 Series Scopes

Tektronix 7B87 Time Base 7854 7000 Series Oscilloscope Plug-In Module (nice)

Tektronix 7B80 Time Base Plug In

Tektronix 7B92A Dual Time Base, for 7000 Series Oscilloscopes - Parts/Repair