mate nekdo osciloskop ??? EEVblog #803 - HP1740A Analog Oscilloscope

Dave saved this classic from the dumpster, a HP 1740A 100MHz dual channel analog oscillocope from the mid 1970’s. It wasn’t supposed to be working so this is a look at the problem, a mini teardown, and some basic PSU troubleshooting. Update: Even after 4 hours it still doesn’t fail with the covers off. So likely to be some sort of thermal issue as suspected. Forum: Original HP Journal article on the HP1740A: