Fosi Audio Phono Preamp for Turntable Phonograph Preamplifier Mini Stereo Audio HiFi Vacuum Tube Amplifier Box X2 For DIY – Musicianbuds
Fosi Audio Phono Preamp for Turntable Phonograph Preamplifier Mini Stereo Audio HiFi Vacuum Tube Amplifier Box X2 For DIY
(87 customer reviews)


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Fosi Audio Phono Preamp for Turntable Phonograph Preamplifier Mini Stereo Audio HiFi Vacuum Tube Amplifier Box X2 For DIY 7
Fosi Audio Phono Preamp for Turntable Phonograph Preamplifier Mini Stereo Audio HiFi Vacuum Tube Amplifier Box X2 For DIY 8


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Fosi Audio Phono Preamp for Turntable Phonograph Preamplifier Amplificador Mini Stereo Audio HiFi Tube Amplifier Box X2


Notice: BOX X2 is only a preamplifier, not amplifier, can not be connected with passive speakers directly, If you need connect BOX X2 with passive speakers, you need to connect it with an amplifier then connect the amplifier with your passive speakers.


  • Tube MM Phono Preamplifier: Converts phono signals to Line Level Signals with low-noise integrated circuits and high-quality components to remove low-frequency noise ensure clear sound quality. Designed with grounding post to protect your turntable.
  • Three switchable gain modes: 39, 42, 45 dB. Adjustable gain levels to give you customizable control and outstanding compatibility. Entry-Level high-end analog sound and top-notch circuitry for an unbeatable low cost.
  • Tube Preamplifier: It’s also a tube preamp with 3.5mm AUX Input. Designed and assembled by Fosi Audio from high-quality components. Great warm, smooth-sounding.
  • Applicable vacuum tube model: 6K4/6J1/6J4/GE5654/6AK5/66*In vacuum tubes, etc. You can replace the vacuum tubes to DIY your stereo system. Different tube with different sound.


  • Model: BOX X2
  • Power Adapter Output: 12V/1.5A
  • Product Adapter Input Voltage Range: AC 110V – 240V
  • Box X2 Phono Preamp DC Input Voltage: 12V
  • Output Voltage Level: 600 Mv @3mV 1kHz
  • SNR ≥ 98dB
  • THD ≤ 0.1%
  • Frequency Response: Standard RIAA
  • Product Weight: 0.66 lb/300g
  • Product Dimensions: 4.66 inch/3.85 inch/1.29 inch
  • Input Mode: RCA+3.5mm AUX

Package Include:

*Box X2 Phono Preamp x1

*Vacuum Tubes x2

*RCA Cable x1

*Power Adaptor x1(Optional)

*User Manual x1

Brand Name

Fosi Audio





Maximum Power Per Channel


Model Number





RCA+3.5mm AUX


Powered Speakers

Power Adapter



6J2 Tube Preamp Amplifier

87 reviews for Fosi Audio Phono Preamp for Turntable Phonograph Preamplifier Mini Stereo Audio HiFi Vacuum Tube Amplifier Box X2 For DIY

  1. N***y

    Very good and packaged, the sound is excellent. I am very satisfied.
    Received in about 15 days in France. Reliable seller, I will come back without hesitation.

  2. P***o

    envío en solo 13 días a Canarias. Producto súper . gran calidad de sonido. estoy súper contento. la verdad es que tiene un sonido muy cálido y un buen acabado.⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐

  3. P***V

    Фонокоректор получил, всё дощло идеально.
    Ещё не включал, как подключу дополню отзыв.

  4. m***h

    very good prodact do the joob perfect

  5. R***r

    A good thing, and externally, and in content. Increases the signal smoothly, without distortion, the low is not lost, even become more voluminous.
    Pulls the sound from the MC head, although it does not seem to be stated. In comparison with budget and built-in amplifiers-victory, definitely victory for it!

  6. D***o

    I’m very happy to received this phono pream. It is really RIAA compliant. 5 stars for all. Recommended. It is more accurate than the built pream of my Yamaha 501. Thank you seller.

  7. J***o

    Great item, great seller! I’m very satisfied. Fast shipping to Hungary. I’am very very happy. Thank you! 🙂

  8. A***o

    Excellent phono stage. Workmanship at altitude. Fast shipping.

  9. A***o

    First of all to highlight the seller. Fosi is a company that has earned my absolute trust, they are serious, they ship fast and all well packed and very professional, they are great!
    As for the product, it’s the best I ‘ve ever acquired, give your s vinilos a warm, enveloping sound that catches you and fills your room. In my case I bought Fosi the GE5654 tubes that are better than those coming from factory and all very well too. Thanks for the service!

  10. W***m

    Very good product

  11. S***v

    Assembled soundly. Assembled, turned on, works. Low coef. Amplification. There are no declared 45.
    And so the sound is interesting low. But do not wait for miracles. Thanks to the seller quickly and qualitatively.

  12. R***n

    Cool foncorrector, noticeably better than built-in, after reading in previous reviews about Russian lamps also put 6 zh2p sound became even better. I’m happy with the purchase. To the seller and manufacturer of this device for long years of life

  13. A***v

    Very surprised by this device! Better integrated into the water turntable TEAC tn-3b and nad pp375 (module optional in the amplifier nad 356, 375). Lamps immediately put 6 zh2p, with complete ones did not even compare. With above listed Sky-Earth, high crispy, volume, bottoms… I’ll go ahead. I took it for curiosity! But if I immediately heard from those devices this sound, H. Z. Maybe he would have stopped… The nad module has already sold.

  14. AliExpress Shopper

    All the best, Thank you

  15. J***o

    excelente producto, cambió en 180° la calidad del sonido, llegó muy rápido a mi país aunque acá se demoraron el doble en entregarlo, muy recomendable

  16. C***r

    I am very satisfied with this purchase compared to my last phono preamp this one sounds much fuller.

  17. R***r

    Everything got intact. Not yet included

  18. P***

    Předzesilovač hraje Velmi kvalitně. Doručení for České republiky během 7 dnů.
    Provedení zesilovače them power hezké.

  19. N***y

    Value for money at the top

  20. N***i

    Good quality. Sounds good. Everything work. Happy as an elephant!

  21. R***

    Arrived on schedule the pre works well maybe slightly high level output even if there is from say my head stanton has a very high. Classic sound tube with leggerissima but beautiful compression. No background noise ne buzz (important) to supply I used one of my old power supply. Recommended for the price.

  22. v***v

    Отправили быстро. Три недели в Мурмандию. Всё цело и работает.

  23. P***f

    Package arrived with a bit delay. The preamplifier works and looks perfectly.

  24. z***j

    szybko doszło nie uszkodzone działa wzmacnia dobrym dźwiękiem polecam

  25. A***v

    Fast delivery, got in integrity. In the work has not yet checked

  26. T***i

    Venditore onesto, spedizione da italia, arrivato in una settimana, costa esattamente 20€ in meno che su amazon! Il prodotto è davvero buono, ho sostituito le valvole con le GE 5654w, comprate su amazon. Com dalla riverstone audio (le uniche originali, pagate 23€ compreso spedizione dall america). Quelle che si trovano su AliExpress sono finte. Comprate senza paura

  27. G***a

    Very fast delivery. Looks very beautiful and has stunning sound.

  28. A***m

    Finaly I got them. Wery long was shipping to Lithuania, about 2 month.
    Packed very well, sound good. I like it!

  29. R***n

    The device is decent, but do not wait for miracles: the built-in phono stage pioneer 604-r sounds “lighter”. Here, expected, more “WATS” in the sound, which fully corresponds to the lamp ideology.

  30. AliExpress Shopper

    Rewelacyjny przedwzmacniacz w swojej klasie cenowej. Współpracuje z AT-LP 120X i amplitunerem Yamaha. Lampy wymieniłem na rosyjskie zamienniki. Piękny, ciepły dźwięk średnicy, z wyraźnym basem i szczegółowymi sopranami. Dodatkową zaletą jest mocniejszy sygnał na wyjściu do wzmacniacza w porównaniu do AT-LP. Jest też coś dla oka… wygląd urządzenia. 😉 Jakość wykonania i wykończenia bardzo dobra. Polecam urządzenie jak i sprzedawcę.
    Dziękuję za miłą współpracę oraz błyskawiczną wysyłkę

  31. M***l

    Ordered on 3-2-2021, shipped the next day arrived 5-2-2021. Product well made. I can’t really test the sound yet as my turntable is not working!

  32. C***m

    very fast delivery and work well

  33. AliExpress Shopper

    Works, only the legs of the lamps, as it is bent and because of that lamp stand with a tilt and lamps of different heights, significantly different, mm by 5 exactly ..

  34. D***n

    superb build quality, sound is gratis, will recommend!!

  35. E***l

    Excellent little phono stage.) The lamps still left their family. Connected to the turntable audio equipment, further into the onkio amplifier. Sounds better than the built-in phono stage amplifier. Adjustment of the gain level works. Looks great in this money. Lamps in the future can be changed to Soviet, experiment with sound. I am happy!
    Delivery from Russia is very fast. Packing quality. Thank you seller!

  36. r***v

    Everything is as described. I recommend the seller.

  37. V***n

    fast shipping. arrived in 5 days from Italy. good quality product.

  38. V***e

    works well with my PC. needs an hour to reach quality levels

  39. AliExpress Shopper

    Very fast shipping and produces surprising quality. You can go with your eyes closed! Do not forget to order with the option “power cable” suitable for your country;)

  40. a***r

    Alles super

  41. D***v

    Works! Good gain! The sound corresponds to the price))

  42. I***s

    Instalado y funcionando, sonido robusto. muy bien empacado. cumple con la expectativa.

  43. e***v

    хороший корректор.с корветом гзм 008 чудный звук.

  44. R***l

    przesyłka w porządku, zgodna z opisem , gra całkiem przyjemnie , polecam.

  45. A***v

    Until the end did not test off later

  46. J***s

    Was spectacular with my Marantz disc. Beautiful and functional device. Great product

  47. O***r

    It came well packed without damage and working. The sound changed radically. Audio equipment 120. To the seller 5 stars and for fast delivery.

  48. W***i

    Bardzo gorąco polecam. Jak dla mnie petarda. Sprzęt super. Nowy wymiar słuchania. Szybka wysyłka.

  49. AliExpress Shopper

    The sound exactly became more voluminous, before that the built-in phono stage was used.

  50. AliExpress Shopper

    Received in less than two days!!
    I kept on the box for several hours to work the valves, and after two days I connected in a chain with head AT-VM740ML, turn TT AT-LP120, this pre FOSI Box, AMP Denon PMA800NE and Polk Audio cases Q Acoustics 3020 and satellites S10E.
    The result is definitely better than using the while honest pre integrated Denon, the sound will soften, it expands, the cases work definitely better, push even longer, the picture music improves in definition on individual tools, improves the stage, earns all in Naturalness…in short, Not riuscirete maybe to hear the black infrastrumentale or situations esoteric various by audiophiles crazy :), but for the price you paid, in the configuration of the house is a purchase by the relationship q/P super; moreover the box warmer No.
    Now think of changing power supply and valves, with other senior quality, as made by other qua…com unque highly recommended!

  51. a***n

    Быстрая доставка. Пока не испытано. Качество сборки на отлично. Лампы пришли другие на картинке 6j2,а пришли 6A2. Возможно это аналог

  52. a***v

    Delivery 4 days from Russia. The sound is really interesting, more voluminous or something. Seller Thank you!

  53. AliExpress Shopper

    Szybka dostawa do Polski, dźwięk bardzo dobrej jakości. Polecam.

  54. A***v

    Not a bad balalaika, delivery in Russia four days. Father nostalgic, looking for domestic lamps. I took it without a power supply, I used the old one from the router.

  55. AliExpress Shopper

    Rather because as stated. Top quality!

  56. A***v

    Неплохой фонокорректор, доехал быстро. Была небольшая проблема с лампами, пришлось подгибать ножки, чтобы правильно попасть в гнездо. Звучит нормально, но не лучше встроенного в ресивер Yamaha R-S700. Брал за 50 баксов со скидкой. Мне он нужен для подключения к самодельному усилителю без фонокорректора. Плюсом является возможность регулировки усиления. За такую цену просто отличный выбор. Рекомендую.

  57. K***t

    Great preamp. Can’t wait to test. Super fast delivery!!! Top seller.

  58. V***a

    The background is slightly. Made qualitatively. with our lamps sounds better, but not significantly. Overall satisfied

  59. D***j

    Powerfull soft sound!!!
    Great!!!! Fast shiping!!! TNX !!!!

  60. AliExpress Shopper

    Excellent product and very quick delivery. Made a real difference in sound detail

  61. K***v

    A good phono stage, compared to the built-in amplifier, so generally the sky and earth.
    With the seller did not communicate, the order reached 1,5 weeks before the MSC.

  62. AliExpress Shopper

    Wow, this preamplifier sounds fantastic. I am very positively surprised, of course I recommend it!

  63. v***i

    Works fine. Sound good. But has a strong emphasis on LF. The top is unexpressive. I’ll accumulate on a normal phono stage, this one will sell.

  64. V***v

    With lamps 6 zh2p sound is better. Audiophiles are not worth buying, cherishing themselves with the hopes of a miracle-only if you try to play a new toy, those more price for such a sound quality is is is Sound of medium hi-fi, I.E. For the rest of most music lovers, the sound quality will be excellent.

  65. N***N

    Great product bought with 5664W tubes
    Very nice listen that the tubes are not yet turned.
    Delivery in 10 days + Order date received by colissimo in France.

    That pleasure, thank you FOSI Audio

  66. O***h

    Супер, у меня в уселке сони фонокоректор стоил,но с этим через уселок ,но просто вход ,звук намного лучше

  67. K***a

    Good packaging and quality product. Exceptional seller!

  68. E***k

    Заказывал из России, пришла за 8 дней до Томска. Лампы реально работают, пока не прогреются звука нет. Звук приятный, более насыщенный. Хотя и на Бриге это слабо заметно. Какие нибудь TDA сильнее преобразит, думаю. Накал есть. Хорошая сборка, приятная ручка усиления,хорошие RCA. Парни, обязательно связывайте Землёй с оконечником хорошим проводом, импульсник даёт на корпус потенциал 55В.

  69. P***v

    Until Chelyabinsk went two weeks. Looks great! Check yet no possibility, you need to make cables for 5 din. I’ll check it out, I’ll finish it.

  70. J***o

    Excelente para una tornamesa de entrada, el preamplificador también es muy bueno para el precio. Solo llegó un tubo quemado, recibí el reembolso por comprar el repuesto.

  71. L***e

    Very nice phono preamp.I am very satisfied with the tube preamp. Exellent packed!

  72. AliExpress Shopper

    Amazing sound. Really impressed by the price. Received in 24h, excellent seller

  73. AliExpress Shopper

    The sound is really good especially with lamps 6 zh2p Russian, delivery is fast, thank you to the seller.

  74. D***b

    Delivery in 6 days. This device brought sound to the highest level.

  75. 규***고

    Well operation. Aging is more good sound, please remember to.. Durable only good if Yagami’s vision into it.

  76. D***v

    Very fast delivery. Sounds great. I am pleased.

  77. T***o

    All right and without rolling, as the valve needs an average of 150 hours, sounds great. Very detailed the generated sound, for me it has good quality. The background noise from which you always run very low, almost imperceptible, which I like. Generally a good purchase. Perhaps tomorrow morning a more quality valve change could do you better, but for the time being the ones you bring sound great. Seller recommended.

  78. D***o

    Great thing! I definitely recommend this before and the seller! Sent quickly, promptly answer questions.

  79. O***k

    Good preamp. Backlight would not be so bright. Grounding is necessary (in my case). Sound like good.

  80. b***t

    This store is great, i received my amp with a broken tube and they sent me 2 new ones. Fantastic sound, very happy customer!

  81. A***v

    I take the second time, quickly, works perfectly, the sound pleases, the lamps changed to 6 zh2p USSR.

  82. N***r

    Fast delivery. Best product. Strong worm and loud. Thank you.

  83. L***i

    Great product arrived on schedule, sounds great quality value above expectations hope in life

  84. g***r

    Phono corrector received exactly on time. Packing is normal, the box arrived almost no damage. Inside the package everything is whole and lies in its places. The sound of the phono stage reproduces normal, not ideal, but very good. Maximum score for price/quality ratio. At 100% “lamp” this sound can not be called (in the scheme there are semiconductor), but the sound is decent. I recommend this device. That’s what I was counting on.

  85. R***o

    Well packaged and got here pretty quick. Very pleased with the sound and performance. Very nice little phono preamp. No hum or buzz. Not sure what gain I should set it on for my amp since all of them seem to work with no distortion.

  86. AliExpress Shopper

    love it. sounds alot better than my previous pre Amp. would recommend

  87. AliExpress Shopper

    fast and save shipment – product works perfect with a single end tube amp (6p1+6n1) – good quality = good sound – reliable seller!!!

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