I had a RS 2100. I think it had a linear volume control. It was scary powerful! 100 watts output at 12 o'clock. Would not play really quietly, even with the 10 db filter.
I still have a Yamaha CR-1020 and CR-2020, a Sansui 9090,d a Technics 5570, and a Marantz 2275. The 1020 and the 2275 aren't monsters, being under 100 watts/side, but that's no problem.
Keep them spinning.