OK I spoke to the manufacturer and they replied that SA amps work for 8 Ohms in class A upto the specified wattage: SA100 -- 100W/ch SA50 -- 50W/ch SA250 is certainly 250W/ch. For lower load impedance they switch to A/B operation type to double the current.
Plinius 8200p is not identical to SA100 since it has lower switching point to the class B and that point is relatively high as well i.e. ~25...30W/ch of class A. I assume that these two units have completely different power supplies and heat sinks if you just take a look even on the pictures of them.
Plinius 8200 MKII has M14 preamp and 8200p poweramp integrated into one chasis with separate power supplies for each part.
Overall I can say that there is a Plinius sound signature on all of above stated but flagship SA series are more open worm and defined.
Despite working in class A on 8 Ohm loads all of Plinius models love the heavy speakers such as Thiel, JM Lab or Apogee and to my thought they do the best job on them.
Plinius 8200p is not identical to SA100 since it has lower switching point to the class B and that point is relatively high as well i.e. ~25...30W/ch of class A. I assume that these two units have completely different power supplies and heat sinks if you just take a look even on the pictures of them.
Plinius 8200 MKII has M14 preamp and 8200p poweramp integrated into one chasis with separate power supplies for each part.
Overall I can say that there is a Plinius sound signature on all of above stated but flagship SA series are more open worm and defined.
Despite working in class A on 8 Ohm loads all of Plinius models love the heavy speakers such as Thiel, JM Lab or Apogee and to my thought they do the best job on them.