Review on Nobsound 12AX7 12AU7 Vacuum Tube Preamp HiFi Preamplifier - Unleash Audiophile Excellence! by Jodi Besch

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 is amazing. Why should it be returned now? The left hand bushing on the 6Z4 is very loose and the pipe wiggles 3/8" to 1/2" back and forth. The right one is also free but acceptable. This should have been easily detected with a good quality check, but unfortunately it wasn't. These sockets seem to be only available in China so I will be returning this one and ordering another one.