Ive had my Ultraverve for a week now, and fully agree with the above comments. Ive owned a few tube preamps in the past, specifically a SF Line 3 & 1, and AI L1 and M3A. The UV jumps past the AI and Line 1 pres, and is more the equal of the Line 3. The difference being that the UV is more naturally full bodied and musical than the Line 3 without being overly ripe, rolled at the extremes, or lacking detail or transparency.
The simplicity of the UV is also appealing. The 5AW4 rectifier tube and 6AH4 cathode follower tubes are cheap relatively speaking, and NOS tubes are not in high demand. One 6SN7 serves both channels, so no need to buy expensively matched pairs. The tubes are driven very conservatively and should last a long time. The exposed 6SN7 makes experimentation easy.
My UV has the optional remote volume. If your amp is relatively sensitive, the volume range can be limited and make fine adjustments a little more difficult.
My system - RA Opus 21 > UV > CJ Premier 140 > VSA VR-4 GEN III SE, RSA Poiema cabling.
The simplicity of the UV is also appealing. The 5AW4 rectifier tube and 6AH4 cathode follower tubes are cheap relatively speaking, and NOS tubes are not in high demand. One 6SN7 serves both channels, so no need to buy expensively matched pairs. The tubes are driven very conservatively and should last a long time. The exposed 6SN7 makes experimentation easy.
My UV has the optional remote volume. If your amp is relatively sensitive, the volume range can be limited and make fine adjustments a little more difficult.
My system - RA Opus 21 > UV > CJ Premier 140 > VSA VR-4 GEN III SE, RSA Poiema cabling.