What tubes are the same tube with different brand names?

[Figaro]

What tubes are the same tube with different brand names?

For instance, I think all Groove Tube models are available as other brands like their GT6V6S is the same tube as the JJ 6V6.

 

[Kelly]

The only new production tubes are Chinese, Sovtek, and JJ. They're relabeled by Groove Tubes, Ruby, and everyone else. Sovtek owns the names Tung Sol, Mullard, EH.

 

[cubistguitar]

Ruby and Groove Tube are rebranders.

the only actual brands of new tubes for guitarists use are:

New sensor and its "brands" (EHX, Sovtek, Tung Sol, Mullard, Genalex, Svetlana)
JJ tubes
Shuguang (makes Tube amp doctor tubes also)
Northern electric (also chinese made, canada qc)
SED (there are no new ones, but there are still new stock on shelves around the world)


everyone else is rebranding others work, some test pretty well as part of the branding (this is where ruby offers a great service)