XDUOO TA-22 Tube Headphone Amplifier 2x 12AU7 DAC 2x ES9038Q2M Bluetooth 5.0 aptX HD LDAC 32bit 384kHz DSD256 MQA - reviews - There are 4 reviews.

perfect xduoo ta-22
neutral sound with very good stock tubes, rolled nos RFT 12au7 from 1960 east germany made. more relaxed sound with more extended highs.

très bon son
j'avais oubliés les 5 etoiles .

très bon son
je l'ai acheter pour sa sortie tubes , car mon ampli rotel manquait de matière dans les medium sur les voix , problème résolu avec ce préampli très bien fini . Et comme toujours depuis plusieurs années un très bon service de la part de toute l'équipe audiophonics. Compter toujours un rodage plus ou moins 100heures , attention quand un appareil ne fonctionne pas pendant quelques jours il faut refaire un petit rodage de quelques heures surtout en hiver.

Perfect
Beautiful, well-finished device, numerous connection possibilities and top-notch features.
Getting started is very easy. I had a little problem with mine unit because voltage switch at the back was placed at 110V instead of 220V when arrived. I didn't pay attention and burned the fuse.
After week of listening impressions are great. Mine Audeze LCD-2 sounded like never before. I can only compare this amp with Unison Research SH sound wise, but Unison lacks power to drive LCD-2 properly.
With this device max volume I needed (on most quiet recordings) was 45 out of 100.
I am pretty sure reviews that will come out will point that this device does not have perfect measurements and I can tell you, I don't care. I didn't by this amp to read charts and numbers but to listen to music.
It sounds great with stock tubes. In a couple of months I will probably replace them with other tubes (something like PSVANE 12AU7-S which you can buy at Audiophonics) , which will probably sound even better.
I am more than satisfied with this purchase, which I can recommend.