about the kt 120 tube

It's a tube made in Russia just like Sovtek and Electro Harmonics. In this case, it's branded Tung Sol. I believe the Chinese might be trying to make a copy of this tube. I don't see the price dropping very much for this tube, I'm just guessing. It uses heavier glass and is a more robust version on the 6550. It is NOT a drop in replacement for the 6550.

thank you hifigeek1

I think the KT 120 has a very reasonable price.

I wonder if this is true?
http://www.hificomponents.ru/publ/news_new_power_vacuum_tube_kt150/1-1-0-33

Wow. Egg output tubes. Who knows. The Russians never stop designing tubes so it wouldn't surprise me.

Hey Gary (Hifigeek1) -- the new egg-tube is very handsome indeed. I think it's called the KT-150. I wonder if this tube is a drop in where the KT-120 works, in particular the current ARC line-up? I'll probably be in contact with Kal this week in regard to my Ref 5 SE upgrade. I'll ask if ARC is looking into the KT-150.