I did notice the built in counter stopped being reliable at 100mhz or just a bit above that, maybe 110. it certainly did not count much above that range.
the waves did show up (I did not have square or triable, only sine) well beyond the 100mhz point.
and again, I was not talking about the 3db point, I was referring to a visual drop-off as you slowly bring the freq up and watch for vertical deflection changes. this will be well below the '3db point' but I wanted to see where any falloff starts to happen. it was the same point on the pre-mod and post-mod scope.
I'll see if 125mhz ends up being about 3db down. it may very well be; but if so, then it probably was that way before the mod, as well.