about the kt 120 tube

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.

I also think it's strange the Chinese haven't come up with a KT120 type, since the design is a gigantic (really...amazing) home run in tubeland, and has been around for a few years. I also would have expected some "gold pin extra cool with fancy writing on it" version to satisfy the hoards of people who need more expensive things. I did "drop in" a set of 120s in an otherwise 6550/KT88 Jolida (after being told by Jolida it wouldn't destroy the amp). They sound great and I've found nothing to make 'em drop out.

that kt 150 tube looks real nice. let me guess?? 200wpc a pair in push-pull circuit. i can see a kt 180 and kt 200 tube in the works

The reason the Chinese haven't copied the Russians might have something to do with their raw materials and their technology. They are behind the Russians on both. After the issues with the first 6550's out of China many years ago, I am wary of them and therefore stay away from them. That being said, the only Chinese tubes I found to be exceptionally good were the EL-34 Treasures. That's about it.