The DR 9 is very old and will need servicing just to assure it is up to spec. I owned the amp and it is fine, but dark and not as good as other SS amps that are newer. CJ MF2300a is a better choice if you can find one. Electrocompaniet also makes better sounding amps.
I would not buy the DR9 unless you are handy with electronics or are willing to send to a tech first for a complete go through. Power supply caps will need to be replaced as well as other work.
I would not buy the DR9 unless you are handy with electronics or are willing to send to a tech first for a complete go through. Power supply caps will need to be replaced as well as other work.