Douk Audio Nobsound 12AX7 ECC83 12AU7 ECC82 Vacuum Tube Preamp HiFi Preamplifier

The Nobsound 12ax7/12au7 preamplifier is a real tube unit, not some faux hybrid, and can form the basis of an entry-level high-end system at a very good price when paired with a decent power amp and speakers. According to reviews, the circuit inside is well designed, and the unit is dead quiet. No hissing or humming, and music comes from a black background after users replace the OEM tubes with higher-quality tubes. However, there were several complaints about the product being unsafe and potentially dangerous, and one reviewer noted that the power supply tubes went dim, and the sound became shrill and harsh after only a few months. The lack of grounding is another issue, and some users stated that the RCA jacks come detached. In general, if you're looking for a solid sounding preamp and are willing to put in the time and money to tweak it up, you can't go wrong with the Nobsound 12ax7/12au7 preamplifier.