Tube Amp Ultra 530 – Free VST / AU studio Preamp plug-in Published April 7, 2016 at 650 × 400 in Tube Amp Ultra 530 – VST / AU studio Preamp plug-in Tube Amp Ultra 530 – Free VST / AU studio Preamp plug-in Tube Amp Ultra 530 – Free VST / AU studio Preamp plug-in