I was looking for a power amp for a pair of Dynaudio Contour 1.8 speakers about 2 years ago. I tried a Musical Fidelity A3CR, Parasound HCA-3500, Audio Research D-200, BAT VK-200, Krell KAV-500 and a Krell KSA-100S. The key thing learnt was that the speakers require a lot of current besides a lot of power. The MF, AR and BAT did sound good but they were underpowered. The Parasound was powerful but sounded bad. The KAV-500 matched best in terms of power and current, but the KSA-100S was best balancing power and musicality.
Tube amps are not the right ones for the 3.3s.
For your stated budget, consider an Audible Illusions Modulus 3A preamp for around $1000 used, Bryston 4BST amp around $1300 used and $300 for a pair of Transparent Music Wave Plus speaker cables.
Your problem with the Yamaha was that the 3.3s revealed the shortcomings of the receiver while the Boston Acoustics did not.
Tube amps are not the right ones for the 3.3s.
For your stated budget, consider an Audible Illusions Modulus 3A preamp for around $1000 used, Bryston 4BST amp around $1300 used and $300 for a pair of Transparent Music Wave Plus speaker cables.
Your problem with the Yamaha was that the 3.3s revealed the shortcomings of the receiver while the Boston Acoustics did not.