B&K ST-140 vs 200.1 mono blocks


I currently had a B&K ST-140...the last version with blue and red lettering, have them on a pair of Castle Inversion 100 speakers 8 ohm, preamp is Melos Reference MA-333, it sounded wonderful with "tube" like sound. Just wonder how will the B&K 200.1 mono blocks compare to the ST-140? You advise and opinion much appreciated!
pioneer48
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!