In an attempt to reduce spam, comments on content older than one year cannot be posted.
Alexis

I'd like this Russian Tube!!! yeah

Walou

Groovetube !!

Zealmet

Good choice. I like the classification system, that GT has designed. You can experiment with the sound, playing with different classes of GT tubes. But they are not manufacturer, it's rebranding. So, I wouldn't use GT, because:
1. Using tubes by manufacturers, You can get needed result, not spending too much money.
2. When I experiment with the sound, I prefer to know definitely which tubes I'm using at the moment. It lets to correct sound with more variety, I think.

Well, I wouldn't use and tubes by amp brands for the same reasons