Review on Fosi Audio Box X2 MM Phono Preamp: 🎵 Enhance Your Turntable's Sound with 6A2 and 5654w Vacuum Tubes! by Timothy Gonzalez

Overall I'm impressed with how this little guy powers my turntable. I paired it with a Fosi BT20A which sends the audio to a pair of vintage Bose speakers. I am giving this unit one star for several reasons. First, the included red/white stereo RCA cable on one end and a headphone jack on the other. This is an odd choice given the use case of this product, especially as it cannot be paired with the Fosi BT20A's audio inputs, which require a red and white RCA! So if you want to use both, have a male-to-male RCA cable handy. While it's good that it comes with two sets of tubes, I don't understand why. Is one pair better than the other? Why is a set of tubes taller? Who knows! The documentation is sparse and offers no instructions. A couple of larger tubes fit with no problem, but I almost gave up on the shorter set. I wiggled and fiddled with them for 10 minutes before finally getting lucky. After all that work, they sound just like the other couple.