And B&K owners here?

I have a B&K ST2140, a later more powerful version of the ST140, which was paired with Mirage FRX-7s and a B&K PRO-10MC. A lovely amp, I "upgraded" to an Aragon 8008BB, exploring "neutral, clean" sound with Vandersteen 2CEs, still with the PRO-10MC on pre duties. 8008BB aids with the discipline of the bass for sure. Not warm, accurate. Better detail, soundstage, so I guess I've moved away from tubey. Currently considering Schiit Freya as pre upgrade. So much to learn, trying to internalize importance of room interaction with system and that more $ is not necessarily better.  I wouldn't do the B&K soup-up route. Nothing against that company, though, know nothing about them. I had a 1967 Scott Stereomaster partially restored. While it's more reliable now, not sure it sounds much better. I know that's not a fair comparison, but the experience has pushed me to go under the hood myself, building confidence and learning about the wonders of audio. I repair job that I paid a tech $237 for cost me about $20 doing it myself on another unit. I know they are selling their amp soup-up expertise, but it just seems to be swapping out higher quality parts. Better to buy a newer unit with a great reputation with the parts the designer intended to have.  Then again. I don't have experience with modded units, so I don't wish to disparage.