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My main concern is damaging vintage test equipment doing these measurements because there can be several traps which we are discussing.
You can add the 2:1 divider ahead of things, but it will actually read 1/3 because the scope ends up a 1MEG load in parallel with the 1MEG lower divider resistor giving 500k.
If you try measure signal on a gain stage's plate, it will get loaded down somewhat.
I realized the 100:1 probe is actually a bad idea. AC-coupled, a scope's input cap will charge to the full DC potential regardless of the probe attenuation, if it's 1x, 10x, 100x because the cap is
ahead of the scope's 1MEG front-end resistor. This is a trap.
If you have any drama with the Leader, check it's PSU rail voltages are OK and then I go after the old Marcon caps.