Review on [2021 Updated] AIYIMA Tube T7 Audio 6N3 Tube Preamp Bluetooth 5.0 Warm Vacuum Buffer Preamplifier with Treble Bass Tone - Ideal for Enhancing Home Theater Systems by Joe Montalvo

This is a good preamp at a good price. I never used the lamps supplied by China, I immediately installed 5670 US military lamps. Compared to my old preamp, which used smaller 6j1 tubes, the bass is noticeably punchier and the tone warmer and more tube-like. I love the unique 3D effect lamps brought to stereo. Aesthetically this one looks a lot better too, with the big bright 5670 tubes sticking out (although the 5670 has a lower profile than the Russian or Chinese versions). This preamp is suspiciously light, actually lighter than my smaller preamp, but the quality is very good.