There really is no reason to replace your SDS with the ADS. In my informed opinion, the ADS is clearly inferior to the SDS in almost every measurable way. Aside from the difference in technology, if you look at VPI's forum, there are a number of complaints regarding the ADS and mechanical hum that may be objectionable to some users.
If you would like me to repair your SDS, I would be glad to do so at no charge. Contact me directly: bill@phoenix-engr.com.
If you would like me to repair your SDS, I would be glad to do so at no charge. Contact me directly: bill@phoenix-engr.com.