Class D amp with Tube Preamp Combo?

Guido, sorry to hijack the thread a bit, since you asking, may I know what is a good matching impedance? Does it mean an equal value of them or there is a factor?

forget to mention, mine is 400ohm output from pre, 25k ohm input on amp, does it mean very bad matching?

Grandetech, from an impedance match you should be fine. Your ratio is 25000 / 400 = 62.5. I suspect that anything greater than a ratio of 25 is above the 'waterline'. G.

I'm not after more mid range warmth/bloom from the new Bel Canto as the existing setup (not from the Bryston 4BSST) has a bit of that compared to other systems i've heard. I was hoping for more resolution and more dynamic sound from the new pairing.

In terms of impedance matching, i think the Supratek Chenin has about 600 ohm output impedance and the balance inputs on the Bel Canto are 20 ohm. Surprisingly, i have to dial up a bit more volume control to make the sound come alive when compared to the 300W/500W 8/4ohm Bryston.

I've asked the seller for their background and he stated they have about 150~ 200 hours playing time so i will give them more time to burn in and report back later if there's joy to be had.

Jaspert, with 150 to 200 hrs on them, the Bel Canto are likely not even a quarter broken in. If at about 1,000 hrs of making real music -- not idle time -- they are still not of your liking, it may be time to move on. Do keep us posted.