I became aware of this label because of a posting at milieu.alexyoung.org , one of my favourite weblogs. Alex recommended Rui Gato - Chaosmos, and right after I listend to the Rui Gato release, I downloaded all the other 9 releases.

I liked the Rui Gato release very much, If you are into "drone music" get this one. the second release (tube'|002 Pitch Boys), leaves me a bit confused, there are realy good tracks and tracks I just skiped. Release #3 (tube'|003 - Kenneth Kirschner - June 18, 1995 et al.) is the one I am currently listening to.

From archive.org :
New York musician Kenneth Kirschner is known in the scene for his atmospheric electro-acoustic and experimental electronics. He has released with Con-v, Sub Rosa (with Taylor Deupree) and 12k Records truly engaging and excelent works. But this release for test tube leaves the fuzzy electro-acoustics away and gives in to spiraling percussion experimentation. June 18, 1995 et al. is full of metal-work. Just listen closely and pay attention to all the beautiful details... feel the wood and metal notes articulating together, building up tribal rhythmic structures that appear to go nowhere, leaving the listener behind picking up the pieces and trying to make them fit together. The apparent cacophony is gently laid on a ambient lo-fi bed, covered with ethereal sci-fi like sound tapestries, reminding us that music is, ultimately, the builder of human dreams.

• Test Tube homepage
  
• Test tube @ archive.org