The Wadia that you are looking for is produced by the McIntosh Group. I believe that most often repairs etc. for the newer A/D series are done by a subsidiary of Audio Research which is also owned by the McIntosh Group. https://audioresearch.com/contact/
class D amp or Hybrid works great with Wadia products. http://www.rogueaudio.com/Products_Medusa.htm
To expand on Nobles response... Back Story:
Wadia was bought out by a hedge fund from Italy called Quadrivio.
Quadrivio at that time their biggest investment was in frozen foods.
They formulated a company called Fine Sounds and went on a buying spree. Under the Fine Sounds banner they absorbed Sonus Faber, Sumiko, REL, Wadia, Wolf, Audio Research, and finally McIntosh.
McIntosh then partnered with a French hedge fund and bank, LBO and Yarpa. They bought Fine Sounds from Quadrivio and re branded as The McIntosh Group.
When Wadia was absorbed into The McIntosh Group production was moved to where it is today, and I believe that none of the original team / infrastructure survived. The McIntosh Group re branded Wadia with the A/D product series. The A/D product series is completely different from the original classic line.
Although they are listed on the website - The McIntosh Group does not provide any support what so ever for any of the " classic products" produced by Wadia before the take over.
George Meyer AV out of Berkeley CA, is only place that currently provides support for the classic models. https://www.georgemeyer-av.com
I believe REL left the group and now operates on their own again.