This unique 7A26 is not part of the museum exhibit but was brought into the museum by the owner Joe Burger.

This is his 1968 prototype for the 155-0022-00 sweep circuit IC.  This IC was used in the 5030 Dual Beam oscilloscope, the 5031 Dual Beam Storage oscilloscope, and the 7B52 100 MHz Dual Time Base plug-in for the delaying and delayed sweeps.

These partial schematics show the 155-0022-00 IC used in the trigger (U330) and delayed trigger (U530) circuits in the 7B52 plug-in.