The special feature of the EVOLUTION MP 5.3 is its Tube Line Stage. This amplification stage, equipped with AVM's own tubes, is located in the preamplifier section of the audiophile masterpiece. Based on these tubes, which were specially made for AVM, we have developed a completely new circuit for the new EVOLUTION series, which fully unfolds the sonic charm of the AVM tubes. Due to this AVM-specific circuit technology, a pleasingly long service life of the tubes is guaranteed (approx. 20,000 hours). The EVOLUTION MP 5.3 also differs visually from the MP 3.3 in the glass pane in the housing cover. The tube stages can be easily observed at work through this darkened window.