Rotel RPM-20

The Rotel RPM-20 is one of the rarest portables in existence. It is even more rare than the RPM-10. The main difference is that the RPM-20 has a digital tuner while the RPM-10 has an analog tuner. That might be the only difference, but we don't know. They appear to share the same chassis and dimensions, so we're assuming their specifications and performance characteristics are the same. But we don't know for sure.

Photos courtesy of Boomboxery member "kingrat2010"