buget used amp ?

Belles 150A Hot Rod. You may have to be patient for one to come up for sale. Yes, I own one of these amplifiers and they offer excellent performance and value. One person's opinion...

Yup that was the deal with me. I went with higher wattage amps on the Mac and they would just open up.. A C20 is the bomb for a great sounding Adcoms.. They all needed tone control, BUT good tone control. C20s have a Bass contour, loudness and tone control. The tube roll is icing on the cake.

Until then

Class ds are gonna be boomy and gloomy with that pre. Better off with an A/B of some sort..

What about Crown for the power and bang for the buck. You can always move it to a bass position and even go with a little valve amp for the mids and highs later on.. Keep the cost down but a plan for the future without breaking the bank..

Respect..

what about a B&K Components - ST-140

I used that adcom pre with a B&K Audio ST-140 with fantastic results.

your budget if you can find one.

https://www.ebay.com/itm/B-K-BK-ST-140-power-amplifier/264764252558?hash=item3da52de18e:g:Ez4AAOSw8R...

I think it’s a bit of a shame to drive your excellent speakers with a $500 amp, but to each his own.  There’s a Bel Canto S300 available here for $750 that at least won’t offend your Thiels.  Best of luck.