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

Tektronix 7B87 Time Base Plug-In Unit - Works

Tektronix 7B87 7000 Series Timebase Plug In

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

Tektronix 7B80 Time Base Module - for 7000 Series Scopes

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

Tektronix 7B92A Dual Time Base - for 7000 Series Oscilloscopes

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