Music Reference RM-10mkiii Kit

I expect your efforts with the RM-10 will be worthwhile.  Many years ago I bought a RM-100 to match with Vandersteen speakers.  It was one of the favorite amps among the many I owned.  At one point I was curious about the RM-10 but felt my speakers at the time would not have been a good match.  I had/have high regard for all of Roger's work.

RM-10’s (in both original and Mk.II iterations) show up occasionally on the used market, selling for around $1200 to $1500. Have your cash ready to pounce on one when it shows up!

Roger designed the RM-200 for low impedance loudspeakers, and produces 100 watts (into all loads) from only a single pair of output tubes per channel (while retaining long tube life). The RM-9 also remains a favorite of classic tube amp design (Dick Olsher prefers it to both the McIntosh MC75 and Marantz Models 8 and 9).

I am a former owner of Audio Research and Atma-Sphere tube amplifiers, but now have settled on RM-9 Mk.2, RM-10 Mk.2, and RM-200 Mk.2's as my "remaining life expectancy" amps. I will never sell them.

Out of the three that you have I see the RM-200mk2 the least. I take it people hang on to them. What are you thoughts on the main differences between that and the RM-9. I know the RM-9 can't handle Apogee type loads is one main difference. 

Out of the three that you have I see the RM-200mk2 the least. I take it people hang on to them. What are your thoughts on the main differences between that and the RM-9. I know the RM-9 can't handle Apogee type loads is one main difference. 

A lot of RM-200 MkII owners use them with Martin Logan speakers. They could power some Apogees as the amps power increases as the load decreases: 100 watts 8 ohms, 140 watts 4 ohms, 125 watts 2 ohms, and the amp is stable into 1 ohm loads. They show up more than the RM-10s do. Personally it’s my least favorite of Roger’s designs. The RM-9 is a beast and if you can find an RM-9 Special Edition you should consider buying it as it is completely point-to-point wired. These amps can drive a lot of speakers, especially the ones with 2 ohm taps. As for purchasing a used RM-9 MkI or MkII I would shy away. As we used to repair them I can say that they are probably nearing end of life, mainly due to the driver boards deteriorating and for which there are no replacements. I heard someone in Europe might be replicating them but I haven’t seen any hard evidence.