The pics were all probed with 10X probe, 1M, 12 pF. Also a 10X 10M 14.5 pF probe.
When looked at with 50 ohm scope termination, straight short coax, not much changed in terms
of ringing, distortion.
I looked recently at narrow pulse, low duty cycle, at 1 Mhz pulse looks like slew rate limiting
of output amp. At 6 Mhz just 1.5 V, lots ringing severely distorted.
Regards, Dana.