@desktopguy - You did not mention if your RM-9s were Mk I or Mk II. I’ll speak with Roger, but you may have the only ones with the triode/pentode switch. That could push the price up a bit. Realistically, these amps generally go for $1500 - $2000 depending on condition. Those refurbished by Roger generally fetch $500 or so more. Given their age there could be some minor servicing needed (power supply caps mainly) but otherwise these are extremely reliable amps. We have many customers that have owned them since the 80’s.
Disclaimer - I work for Roger/Music Reference
Disclaimer - I work for Roger/Music Reference