Nobsound 12AX7 12AU7 Vacuum Tube Preamp HiFi Preamplifier - Unleash Audiophile Excellence! Review

What an amazing tube preamp. The tubes that came with the kit are suitable for most people, but I needed something more. I have ridden the Mullards (reissue series) and all I can say is WOW! So pure and wonderful to listen to. My vinyl collection consists of pop, rock, metal, R&B and rap. They all sound fantastic. Musically everything is there. I hooked up a preamp to a Rotel 980BX and a pair of Advent as2s. Great combination IMHO. I left some photos to show inside. The stitching is much…

Build Quality: Inexpensive but functional tubes. A cheap selector switch can get stuck between inputs and cause audio to be muted. OK, potentiometer. Capacitors with WIMA inscription. The power transformer is 110V, which is different from the 115V in the picture above. Most importantly, the entire setup is not properly grounded which creates a ground loop unless I somehow connect the input to my Pro Power Amps. Sound Quality: Fairly good after grounding. Slightly mid-centered, but with a subtle

In every respect this preamp is a great achievement. At $210, it's almost a miracle. I use it with a good 120 watts per channel solid state amplifier. The soundstage is wide, deep and very detailed. The timbre of the voices and instruments is very reminiscent of the live sound. I have seen many famous singers live including Kathleen Battle, Renee Fleming, Kurt Moll, Diana Krall, Placido Domingo and many more in 15-20 years as a subscriber to the Met in New York and at concerts elsewhere and…

After trying several reasonably priced tube preamps in various configurations, I decided to try something better. The difference is so noticeable my kids have been asking me if I have new speakers or an amp. I switched the signal lamps to Phillips and Electroharmonix and after about 10 hours the sound was really good. I hooked it up to a mid-range Yamaha solid-state amp, as well as reference speakers and an Energy subwoofer. It's worth every penny so far. Expensive cables, DAC voltage…

When I first ordered this box I was suspicious of this box given the price but was amazed when I turned it on. This is an absolute gem for the price. Even with original Chinese tubes, the sound was rich, warm and meaty. And with four inputs, there's plenty of room for components (but no phono stage). The box itself is a solid piece of metal sandwiched between handsome blocks of wood and topped with massive knobs and switches. I was a little worried it would look like a toy but it is a rock…

So I got this on 09/14/2020 in a well packed box. WIMA and Nichicon caps. JJ 12AU7 bulbs, but 6Z4 rectifier bulbs are of lower quality than 12AX7 bulbs. The point to point soldering is very good. The input selector has an illogical wiring for 4 inputs. The rear panel connectors are numbered 4-3-2-1 from left to right and the selector switch is numbered 1-2-3-4 from left to right. Crazy. I replaced the rectifier tubes with good Russian tubes and the 12AX7 with NOS 1966 Mullards tubes. The sound…

I really like the sound quality of this inexpensive tube preamp. It's supposedly based on the classic Marantz M7 design, but I'm not sure because I haven't reverse engineered the circuitry yet. The included Chinese lamps seemed a bit flat for my taste, even after 24 hours of warm-up time. Instead, I installed some nice old JJ Tesla light bulbs that I bought on eBay through Viva Tubes. Now the device has a rich, expensive sound that will appeal to most serious music lovers. Now I can listen to…

Bought a bit by accident. I know the circuit and it looked well put together (see photo and schematic in Q&A). Worst case I could use the case and connectors for a DIY project (buying everything individually wouldn't be far from what I paid for it). I received it well packaged in a double box with a mouse and in the promised time. All lamps were individually boxed (as they should be) and fit in easily. Doesn't sound good at first, but after a few (2-3) hours the sound opens up and sounds…