I know this is an old thread but Art Audio has returned to the US and we are the new distributor. For anyone who has run into issues previously, I will be happy to work with you. Please reach out directly at "info@verdantaudio.com."
If you are looking for service on your old Art Audio gear I am happy to help you find a service center.
These are wonderful amps that look amazing and sound even better. We will do our best to address any outstanding issues.