There's at least two versions of Au-X1: the early version, which was prone to oscillation, and the later production run which seems to be impoved/fixed.
To best of my knowledge, EU versions very rarely (never?) had the oscillation problem, and there seems the problem is linked to NFB loop due to very large bandwith.
AU 919 doesen't have this problem due to stabilisation circuits on the output, although the circuits are similar.
To best of my knowledge, EU versions very rarely (never?) had the oscillation problem, and there seems the problem is linked to NFB loop due to very large bandwith.
AU 919 doesen't have this problem due to stabilisation circuits on the output, although the circuits are similar.