After flipping them to the correct settings this thing sounds phenomenal.

First thing I noticed the default gain was a bit low, then I tried setting the gain to max at ten, this made the Carbon volume a lot higher, but introduced a pretty significant buzz from the tubes

This thing is dead quiet

The most important thing is to replace the default tubes with the tubes I listed above and make sure they are a matched pair

Surprisingly hefty for the size, due to the transformer (a good thing)

Surprisingly hefty for the size, due to the transformer (a good thing)

The interchangeable tube 'thing' is great

Then I turned up the volume on one of my fav T swift songs and was SHOCKED at the transformation the song went through upon passing through these vacuum tubes