@MirrorProfiles Thank you for adding the Helix Invective model. I think it sounds really good. With slightly less gain, it could probably be the model that sounds closest to the real 5150. However, it does apparently need some more extreme settings.
Back in the day, Kazrog's Thermionik was, alongside TSE's X50 (which I liked even more), the hot stuff when it came to amp emulations and far superior to anything better-known companies were offering at the time. It's a real shame that neither of them were developed further. Ampcraft 1992, on the other hand, did not appeal to me at all.