These are short samples of my mic pre shootout.
Both mic preamps were adjusted to (almost) the same output level and recorded into my DAW. The Gain on the BlueTube was almost all the way up, while the Behringer still had some reserves..(?!)
Signal chain was as follows:

Mic -- either mic pre -- mixer inserts -- a/d-converter -- DAW
  xlr-xlr        insert cable       rca cables           lightpipe
  

All Samples are 128kbps mono mp3, approx 7-8 sec long. Filesize is around 130-160k per sample.

Marshall V67 -- Blue Tube

Marshall V67 -- Behringer Ultragain

Shure SM57 -- Blue Tube

Shure SM57 -- Behringer Ultragain

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