Jadis Orch Ref vs opera consonance m100plus

IMHO don't mess around with equipment made for differing line voltages than what you have, as it could very well end up to be way more of a problem than you bargained for. I can't speak to any of the amps you mentioned except the Jadis, which I own and absolutely love. I have not tried to change power tubes yet (difficult to bias) so I may change my opinion in the future. Good luck on your search!

.. well i dont know if it matters because in a way these are different hiquality electronics, but i have been running 4 synths (two full keyboard and one antique), a drum machine, 100w amp, 60w fender tube amp, 14ch mix board, echoplex and other efx all on a 500w 240v to 120v step down since moving to europe in 1998 (with two 6 plug power strips), and the fuse has never blown in it... and i use i now use a 96khz 1000usd professional sound card for recording and have no problem with "noise" from the system on the recordings...nor in the speakers...

but like i said hifi might be different than musical instruments and digital recording...

What is the standard voltage in Finland? The Jadis is French and uses European voltage as a standard. The JOR is a much more expensive amp than a M100 plus and sounds quite different. I doubt that you can find one for $1200 used. The last couple on ebay weren't the Reference which is even more expensive than the regular Orchestra, and the standard orchestra sold for close to $1,500 looking well worn. Since cost is a major issue for you, if you like the sound of the Opera/Consonance, which I own, then I would buy that. It will cost you a lot less if you find one used you'll get a real bargain. I enjoy mine a great deal in my system but is not a Jadis!
My good friend is a Jadis fanatic and I heard his old Reference many times. I am not going to do a review comparing these 2 amps because I found them to be extremely different, and Jadis really can't be head to head compared because it is in another cost category alltogether. Have you compared the retail on these 2 amps? Have you heard both?