B&K ST-140 vs 200.1 mono blocks

I've had the B&K ST-140 and M 200 mono blocks (not the 200.1s)in my system, and IMHO they are very different amps. The cap coupled ST 140 is warm, rolled off in the highs and a bit mushy in the bass, the DC coupled M 200's were cooler, more extended with tighter bass, much more authority and capable of handling lower impedances much(!) better. BTW, due their somewhat low input impedance, neither is really a great match with most tube pres with their typical high output impedance.

Thank you for all the responses so far; I heard comments that the ST-140 produce more tube like sound...and I feel the same way too. Moreover, I don't really have a big listening room, so may be better off stick with the ST-140 instead of going for the more powerful 200.1 mono blocks!

I believe Unsound has provided you with good info. When considering an upgrade it is best to have defined what improvement one is looking for. If you are happy with the 140 and it drives your speakers to your satisfaction then keep it. Enjoy!

Right on Mesch and Unsound...much appreciate your comments!