The Analog Room in San Jose does.
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I've got a modded EAR 834P and was able to do extended comparison to my old unmodded one. Night and day, even that I loved the unmodded one. Also NOS Mullard CV4004's are fantastic. That's what I settled on.
I bought this particular 834p already modded and it's an extensive mod, but I don't know who did it so can't recommend source alas. It looks like the mod is very substantial upgrade of parts. I can email you pics of unmodded vs modded if you like, it's a kick.