I was just given a 576 Beta model. It started out having no step generator but after some tedious cleaning and other sadly needed maintenance it started working. The problem that I need help with is the linkage for the "max peak volts" and "series resistor" control is disintegrating (it looks like Delrin) and thoughts about finding a replacement or maybe even having a machinist duplicate the parts in aluminum or maybe even Lexan. I would imagine that these parts are rarer than hens teeth but it's worth a try anyway. I was given three test beds and the interlock with is as well. Nice bright trace, digital displays work well. Amusingly, they swapped the intensity controls for the readout and the graticle. They also an additional 2 unidentified knobe on the plug in - I posted some photos for the curious.
