Got some time today so am looking at the 475A. It passed the check out procedure apart from three things:
1. The timebase control is a bit janky and doesn’t register at each detention well.
2. Sweep shifts right on 5ms and 50us
3. DM44 time readout is so far off it’s useless.
I am spying a timebase tear down and clean
Annoyingly it’s either the timebase or the attenuators that are shot in every 4xx scope.
I may sacrifice the 465 if I need timebase parts however for this one.