by carlaz » Tue Dec 07, 2021 6:50 pm
They are from very different eras of AmpliTube. The British Tube Lead 1 dates back to, I think, the AmpliTube 2 era. It has been updated since then: up through AmpliTube 4, it retained the swappable preamp, EQ stack, and power amp sections with which it was originally released; these went away in AmpliTube 5, though other enhancements were made at the same time. The Brit 8000 was an all new model from the AmpliTube 4 era (though whether or not IKM based it on the same physical JCM800, I don't know -- that's one that perhaps only the IKM engineers could possibly answer!).
In general, I would say that you can expect both models to sound fairly similar, though the Brit 8000 is, of course, newer and thus perhaps more "accurate".