Interesting look at the Van Halen Keys setup from OU812 tour

[nursers]

After much research, this is what I have found about Jump and live performance

 

1984: C

1986: C

1991-1993: D

1995: C#

1998: C#

2004: C#

2007: C#

 

Etc

 

They went to D a couple years and then 'down' 1/2 step to C# as Sammy got older and of course kept it there when DLR came back.

 

Even the kinda cringy performance of it on Ellen in 2015, it"s clearly C#. And when you look closely Eddie is playing around the D formations

 

I call this as solved then David - seems EVH must have been handed the wrong guitar or incorrectly tuned guitar.... Great sleuthing!