I know that this is a Prehistoric Thread at this point, but anyone searching for Amber Info might still find this interesting. Amber amps, and Preamps, were (very well) built in Charlottesville, Virginia. They earned a spot in the High End room at Stereo Sound in Chapel Hill, NC. Sounded great with the Linn Sondek and whatever speakers we hooked up. Very warm and lush without
over-doing it. I don't remember any problems at all, but of course that was a very long time ago...early Eighties. Michael Jordan was college kid playing at UNC at the time ; )