ARC LS15: did they ever use Mundorf MCaps on it ?

No, unfortunately it was not modded by GNSC: that would have been a different matter, indeed.
I know people, even here in Italy, who are very able at modifying electronics and I would trust them; Huntley is world famous and he would sure be one of them (btw: is he out of business ? I think I've read something about it).
But that 15... no one knows who put his hands in it.
Anyway, now that's past. :-)

Thanks again to you all.

Good luck with the ls16 bid

GNSC is no longer in business.

HifiGeek, you have all my respect for your knowledge of Audio Research gear. If I recall correctly you are one of their official off-factory repair depots. I sincerely hope you dont view GNSC's cease of operations as a one less competitor. Huntleys mods are expensive. But for many of us it sure beats paying big $$ for trade arounds.

Thanks for your wishes, but meanwhile several people tell me that even the LS16 would not be that great improvement over my LS7 and suggest me to go straight for a 22 or a 25 without caring for the... numbers in between (14,15, 16, maybe even 17).
wow ! confusion !
anyway, I guess I'll take some time to think it over and make up my mind.
thank you all.