Your speakers are rated around 100 watts RMS with 150 watt music rating. But if they were built here, they would be probably rated at 200 watts peak. Now Canton has made some very nice speakers over the years and like the Danish B&O their forte' is the their mid bass to hF reproduction. Bass can be any where from tight and well controlled to a little shy depending on their placement. They are point source speakers and are designed to work in smaller rooms with shorter working distances. That all said they would make very nice primary Stereo speakers. If you love your speakers with a Yamaha unit you don't need tubes. Tubes are a very expensive indulgence. They cost tons to buy and are not cheep to maintain. Why restrict your self to lower Signal to noise ratios, magnitudes higher distortion with less woofer control and some times restrained highs, just to gain some midrange enhancement. Your speakers are great in the midrange area, so they don't need any help. And your tweeters will reveal any short comings of either tube or SS.
The choices out there are endless, and unfortunately you can't demo equipment like we use to in the 60's and 70's. Now if this to be a long term experience, I would recommend Mcintosh. The 7000 series is a good place to start. But if you want almost todays performance at a more reasonable price, you night want to look at models built in the early 2000's. Integrated units give the best performance for dollar spent. Separates will give you more dynamic range with very quiet back grounds, But consider this if your speakers are rated at 90db sensitivity then 200 watts would mean 113 db maximum. And even at 2 in the morning your residence will probably have a self noise around 20 to 25 db. Which when subtracted from 113, would be around 93 db dynamic range. Now the ear can listen into noise another 10 or so db. In other word if you hear hiss at 30 db you can still hear midrange 10 to 15 db lower in level even with the hiss being present. So add 10 db and you need an amp with 103 db signal to noise. N\ow I will admit if you listen 10 ft from your speakers the output level will drop almost 8 db meaning you only need 95 db signal to noise. So the choice is up to you. Anything below .1 % distortion is OK. Your speakers will have many times that amount. Check out Berner's website on Mcintosh to get an idea for what meets your needs. Then call round and take a test listen if you can. And remember because this is a long term commitment. Don't buy the first thing you see. (hear).
Another choice is NAD, they work well with European speakers with their smooth highs and defined bass. Pricing is negotiable and deals abound. Designed in Merry old England, but built abroad they are economically a good choice. Of the Oriental units, I prefer Pioneer Elite , and some Marantz units. Though Denon has a great vibe I'm not a fan, preferring Integra. Accuphase is my favorite Oriental brand, but here again this is a long term investment. $$$$$$$$. But in return you will gain great performance like Mcintosh for many generations.
