Has anyone heard of a company by the name of TCI that apparently produces electrolytic capacitors? I'm looking to recap an HV supply I have and want to use only the best for the sake of safety and reliability. I've done a fair bit of Google searching and have not found much.

If you want only the best, why would you even consider a company that has no background, no reputation and no internet information?

I'm curious and perhaps my searching didn't uncover something. It's always worth asking.

T.C.I. is an old brand of electrolytics that I have seen over the years, and may even have some
around here.

They were used in marine radar, British Radio gear or television sets, I don't recall which.
I've got the image of one in my head now. When I find it I'll post a pic.

The trade name may have been snapped up, though, which means the TCI caps of old have
little to do with what may be out there today.

I'm sure old TV bench techs will remember them. Marconi or Emerson sets?

Maybe you're thinking of "TCC" which was a British Capacitor company? I'm not sure if they still produce new products though.

Telegraph Condenser Co.

Yes, it is T.C.C. And there is a lot of old British stuff that I am going to look at now.