Basic Oscilloscope question

[boywonder]

I recently picked up a used oscilloscope and would like to test various high voltage things on my tube amps, like PS ripple, rise time, etc. The BNC inputs on the scope are labeled 400V max.

I have a 600V rated 10:1 probe with a clip lead, so I am assuming that the probe has a 10:1 voltage divider and that I can safely measure voltages up to 600V with this setup since the scope will be seeing voltages less than 60V max (600/10) and the probe can handle 600V from a dielectric standpoint.

Am I missing anything here? I don't want to zorch my scope.

[Mooly]

Your essentially correct.
Remember the 600v rating is dc + ac.
The 400 volt rating on the scope "may" be a DC rating only.
Both the probe and the scope input may need derating if viewing high amplitude HF signals due to power losses in the resistive/capacitive probe divider network.
In practice for any audio work you won't have problems, if you were trying to view a 100mhz 600 volt squarewave with high risetimes you would.
Make sure you check and adjust the probe compensation cap correctly using the "cal" output on the scope or use a 1 khz or so squarewave from a decent generator. Make sure that it's reasonably correct on all attenuator settings of the scope.

[EC8010]

The input voltage rating on an oscilloscope usually matches the voltage rating of the 100n input coupling capacitor. You're right about the potential divider in the probe.