Besides the recommendations made by other members above, I would also recommend a vintage Yamaha integrated amplifier like the CA-2010, CA-1010 or CA-1000. From my personal experience, these are excellent amps & since the Europas are a benign 6-Ohm load, the vintage Yamahas should handle that quite well. There amps can be restored to full spec.
SPeaking to Roy over the past years, I also remember him recommending vintage Onkyo & Marantz amps.
Roy also likes Atmasphere amps but they are not s.s.
Another choice is the Canadian Blue Circle amps - they have several s.s. choices amongst their tube offerings.