How to make sound less detailed with warmth?

I can't believe Ryder is the only one to mention room acoustic/setup issues. 80% of the sound you hear is the result of the interaction between the loudspeaker and the room. Before changing anything you need to consider these issues.

I can't imagine the amp is the root of your problem (ie lack of warmth/musicality). You're not likely to find an amplifier that's warmer than the B&K M200 without spending ~$1000+, and even at that price SS amps aren't likely to bring more warmth and musicality (at least I haven't found one). Tubes may be the way for you to go.

As for repairing your dead amp, have you checked all of the Fuses? I would check all of the fuses first. This includes the rail fuses inside the amp. You'll likely need to remove the driver board to check them, so if you're not comfortable with this, you can send it back to B&K or take it to a tech. Don't just visually check them, use a continuity checker. If it's just fuses, or something simple it will probably cost you $100 plus shipping (they'll do a complete checkup and bias for you while it's there). If your problem is with the output mosfets B&K probably won't be able to repair it - I don't think they're available anymore. I think the latter diagnosis will cost you ~50 plus shipping.

I think it's a coin toss as to whether you should repair or sell as is, and replace them. IMO it's worth repairing, but if I was interested in upgrading anyway, I would sell the M200s as is, and buy new amps.

One last thought - have you evaluated your room? Maybe room acoustics are to blame, at least partially.

Thank you all for your invaluable responses!
I was quite surprised by the number of posts!

I guess... the most cost effective way is to start with changing a tube then and check surroundings. My floor is carpet though. Maybe the window right next to my speaker is troublesome.

I sent back the BK m-200 to manufacturer (San Francisco to New York is quite expensive). I thought this was the easiest way to fix it.

Thank you all! I will post the update later!

The Thiels are going to be very detailed. A positive for listening to classical music, maybe a negative for jazz and rock. Ultimately depends upon your personal preferences and musical tastes.

Before getting rid of them, you should spend some time with speaker positioning. Remove the toe-in, move them farther apart, and sit farther away. Sometimes even a few degrees of toe-in can make the difference. It will probably take several weeks of positioning to get them tuned.

Rob

I would pin most of the blame on the Thiels. In my early audiophile days, I was a Theil owner (mid-80's, model O3A). At that time I was also getting interested in classical music and it became very apparent that the Thiel's would not produce violins naturally - they always had a glare and edge in the top end that was fatiguing. The Theil sound signature continues to this day IMO. In recent years I've had Spendor SP 1/2E's which are very musical (but lack the deepest bass) and now the Vandersteen 3A Sigs which give the whole package - very natural high end, great soundstaging and wonderful bottom end. For less money, the Vandy 2CE Sigs are also very good. So my advice is to change your speakers first. Next, I'd suggest a decent tube amp. Good luck.
Mark