@haimr we're a Magico dealer and have tried a handful of tube amplifiers with the Magico S- and A- series speakers.
I know someone who is using the S1 MkII with a VTL ST-150 and is very happy with the combination. I've also tried the VTL S-200 Series II and Audio Research ST-80 SE, and they both worked well. I can also recommend the VAC Sigma 170 iQ and PrimaLuna Evo 400 power amplifier as both being able to drive the moderately difficult load presented by Magico speakers better than some other tube amplifiers.
I know someone who is using the S1 MkII with a VTL ST-150 and is very happy with the combination. I've also tried the VTL S-200 Series II and Audio Research ST-80 SE, and they both worked well. I can also recommend the VAC Sigma 170 iQ and PrimaLuna Evo 400 power amplifier as both being able to drive the moderately difficult load presented by Magico speakers better than some other tube amplifiers.