Thanks to those who contacted me offline on this topic. I have continued to do due diligence on both amps and tuners, including discussions with HRO and DXE personnel, as well as an email exchange with Acom in Bulgaria. LA-1K getting a strong thumbs up. FWIIW, both DXE and Acom say there is service for the A1200S in the U.S. DXE states that if the amp is purchased from them, they will provide both in-warranty and out-of-warrant service. This is confirmed in my email from Acom. Have added Expert/SPE to my list of candidates and will check this out before going ahead.
RB
K8EZB