I wouldn't even think of interfacing the 1S1 with anything other than a 530,540.550 series Tek scope. It's a complex interface, involving not just the connector but several different power supplies ranging from 6.3 volts up to 500 volts. The plugin also has to sink 150 mA at 75 volts from the mainframe. The differential output of the plugin has a 67 volt common mode component that matches the input requirement of the 500 series Tek vertical amplifiers. Some of the 540/550 series also had a sync interface. The only thing you can do is keep your eyes peeled for a suitable mainframe. The most desirable one IMHO is the 547 although it is prone to the HV transformer thermal runaway problem. The 535A which does not have that problem would be the next best.
Good Luck!
Morris
