Because you have a dot on your screen, I'd say your power supply is OK. My guess is you've blown your vertical amp, which is in line with the measurement you were taking. On the other hand, your power supply might have different outputs for the vert/horz amp and the CRT curctuirty, so you'll need to verify the voltages. You can do that with a DMM. The great thing about your TEK is you can troubleshoot the circuity, as it's mostly discreetes. The bad thing is you need another scope to see what's going on. I had the same conundrum a couple years ago, so I broke down and purchased a 2nd scope.