Fosi Audio Box X4 Phono Preamp with Vacuum Tubes for MM Turntable Phonograph Record Player with Volume Bass Treble Control
Fosi Audio Box X4 is an upgraded tube MM phono preamp with 3.5mm AUX input, headphone output and swappable tubes, with a DC 12V supply.
Price range: See on Amazon
What we liked
- + Listed as the upgraded version of the Box X2 with a tube headphone amplifier.
- + Supports 6K4, 6J1, 6J4, GE5654 and 6AK5 tubes for customizing the sound.
- + Includes two tubes, a power supply and a manual.
Trade-offs
- - The shipped tubes (5725W or 6J1) are sent randomly and cannot be specified.
- - The listing covers MM cartridges only, so MC cartridge owners need a different preamp.
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