I've got a Variax 300 that I use occasionally (2-3 times a year).
During my last recording session I noticed some quite audible distorsion when I play more strongly. More so if the unwound strings are played together.
Even if I reduce the (onboard) volume, the level of distorsion stays the same. It's just due to how hard I play and most prominent on the B string. I've checked the obvious like the batteries and power brick supply, which both seem good. The distorsion sounds like overdrive rather than added buzzing, so it is not (obviously) mechanical.
Maybe if it's something easy like a trim pot adjustment or a connector getting unseated or oxidized. Or less easy, like problems with the piezo elements or tired capacitors.
I'd much appreciate any advice regarding the issue.
Thanks,
HasseFX