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Stonecat

JJ

Rob Marshall

MESA for my Mesa 

Travis L.

my mesa boogie tubes

CSOMEX

Döme N.

:s cant really afford tubes, so i dont know much about them

Adam Kasnyóczki

I don't really know, matched mostly.

Vedran P.

Svetlana

Alexander G.

sovteks are nice.. rubys as well ..

Ian Rusconi

New Sensor Corp. They're the rights holding parent company that makes Electro-Harmonix, TungSol, Mullard, Genalex, Svetlana, and Sovtek. They're ALL made in the same factory in Saratov, Russia. That's not to say that they sound the same, they're all constructed in slightly different ways.  

I use a quad of Genalex Medium Gold Lion KT88s in my VHT Pittbull UL. The headroom is bonkers. 

Zealmet

Yeah, i'm agree, i just haven't specified Genalex and Svetlana because i thought that they are too rare

John G.

electro

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