Electronic Switch/Dual Tracer

[Smithdoor]

My next project is a Electronic Switch aka Dual Trace for a Oscilloscope.

Here my schematic

 

[Smithdoor]

Here is a better information on using a Electronic Switch

FYI I used my Eico 488 on my 435 without using SYNC.
If looking for the SYNC it can located on front panel, on back of Oscilloscope or on Horz input and switch to SYNC and may not be labeled but on Switch.