So, I'm trying to learn about JFET preamplifiers, mainly thanks to their low noise characteristics. Here I tried to test a simple JFET preamp with (hopefully) standard components, mostly taken from appnotes. I added a low pass filter in the feedback, since the frequencies I'm interested in are much lower.
As I tried to add a real opamp (in this case, a general NE5534, tried also with a JFET, more modern opamp - LT1792) I noticed this ugly spike at very high frequency (>10 MHz) in AC analysis, well beyond the operating range of the opamp. I'm wondering what this is due to, because I didn't find any info about it and I can't understand where it comes from. Is this some simulation artifact or should I worry about that in general?