Embark on a Warm & Rich Musical Journey

The essence of tube amplification, experiencing the perfect harmony of technology and nature.

  • RMS Power: 250mw @16Ω; 150mw @32Ω; 32mw @250Ω; 20mW @300Ω
  • Headphone Impedance: 16-300Ω; SNR: ≥103dB; THD: ≤ 0.02%
  • Input: Bluetooth 5.1/RCA; Output: RCA/AUX/3.5mm headphone jack; Dynamic Range: 104dB; Frequency Response: 20Hz-20kHz(±1dB)

Key Parameters

Signal-to-Noise Ratio≥103dB;
Noise Floor: 64uV;
Crosstalk: 95dB

Mode Indicator

RCA mode: steady red light;
Bluetooth pairing mode: blue light flashing;
Bluetooth connection built: steady blue light.

Bluetooth Connectivity

Bluetooth Range: ≥10m
Bluetooth Version: 5.1
Bluetooth Name: Fosi Audio P3

Bluetooth Reset

Press and hold for 3 seconds to clear Bluetooth pairing to solve the problem of Bluetooth being mistakenly connected by others.

Product details

Description
  • True Tube Amplification: The preamp circuit elevates the voltage to 54V, ensuring the tubes work to their full potential, delivering a warm and rich experience. The unique preamplification technology delivers pure audio signals, faithfully reproducing crisp high tones, full midrange richness, and deep, rhythmic bass. 

  • Bluetooth 5.1: Equipped with the Qualcomm QCC3031 chip, the P3 preamp guarantees impressive wireless sound quality and low latency, with compatibility for aptX HD and aptX LL codecs formats. Furthermore, the inclusion of a manual reset button prevents accidental connections by others, enhancing connection reliability.

  • Versatile Connectivities: The P3 provides Bluetooth/RCA inputs and RCA/AUX OUT/3.5mm headphone outputs. It can help create a 2.1-channel audio system by connecting active speakers/an amplifier and a subwoofer. As a headphone amplifier, it supports headphones with impedance ranging from 16Ω to 300Ω.

  • Premium Components: It utilizes ELNA audiophile-grade capacitors and taper A pot. The bass and treble controls boast central detents for tone-defeating. With an SNR of up to 103dB and a crosstalk of 95dB, it helps form a HiFi audio system when paired with the V3 amplifier of the same series.

  • What You'll Get: Fosi Audio P3 Tube Preamplifier x1, User Manual x1,  Vacuum Tube x2, 12V/1.5A Power Supply x1, a 24-month worry-free warranty and responsive customer service. 
Specifications
  • RMS Power: 250mw @16Ω;150mw @32Ω;32mw @250Ω;20mW @300Ω
  • Headphone Impedance: 16-300Ω
  • Noise Floor: 64uV
  • Input Mode: Bluetooth, RCA
  • Output Mode: RCA, 3.5mm Headphone Jack, AUX Out 
  • Frequency Range: 20Hz-20kHz(±1dB)
  • Dynamic Range: 104dB
  • THD: ≤0.02%
  • SNR: ≥103dB
  • Crosstalk: 95dB
  • Bluetooth Chip: QCC3031
  • Bluetooth Version: 5.1
  • Bluetooth Range: ≥10m
  • Bluetooth Codecs: SBC/AAC/aptX/aptX HD/aptX LL
  • Power Input DC: 12V/1.5A~3A;
What‘s in the box?
  • Fosi Audio P3 Tube Preamplifier x 1
  • 5654W Vacuum Tube x 1
  • 12V/1.5A Power Supply x 1
  • User’s Manual x 1

Which Product is right for you?

Compare products to find the best one for your needs.

Fosi Audio P3 Tube Preamplifier
From $79.99

Fosi Audio P3 Tube Preamplifier

Type
Preamp+Headphone Amp
Power Supply
DC 12V/1.5A
Input
Bluetooth, RCA
Output
RCA, 3.5mm Headphone Jack, AUX
Treble & Bass Control
Yes
THD+N
≤0.02%
SNR
≥103dB
Fosi Audio GR40 Tube DAC Headphone Amp Preamp - Fosi Audio
From $119.99

Fosi Audio GR40 Tube DAC Headphone Amp Preamp

Type
DAC+Headphone Amp
Power Supply
DC 12V/1.5A
Input
Bluetooth, USB, Optical, Coaxial
Output
RCA, 3.5mm Headphone Jack
Treble & Bass Control
Yes
THD+N
<0.003%
SNR
≥103dB
Fosi Audio P4 Mini Preamplifier - Fosi Audio
From $99.99

BT20A Pro Bluetooth Stereo Power Amp

Type
Preamp
Power Supply
DC 12V/1.5A
Input
RCA x3
Output
RCA, Pre-Out
Treble & Bass Control
Yes
THD+N
≤ 0.003%
SNR
≥110dB
Fosi Audio ZD3 Fully Balanced Desktop DAC - Fosi Audio
From $179.99

Fosi Audio ZD3 Fully Balanced Desktop DAC

Type
DAC Preamp
Power Supply
DC 12V/1.5A
Input
USB, HDMI (ARC), Coaxial, Optical, Bluetooth
Output
XLR, RCA
Treble & Bass Control
No
THD+N
<0.00008%
SNR
≥126dB
Fosi Audio SK01 Headphone Amplifier Preamp - Fosi Audio
From $79.99

Fosi Audio SK01 Headphone Amplifier Preamp

Type
Headphone Amp+Preamp
Power Supply
Input
3.5mm Line In
Output
3.5mm/6.35mm Headphone Jack, 3.5mm Line Out
Treble & Bass Control
Yes
THD+N
≤ 0.001%
SNR
≥108dB
  • 5 stars: 60 (82%)
  • 4 stars: 9 (12%)
  • 3 stars: 3 (4%)
  • 2 stars: 0 (0%)
  • 1 star: 1 (1%)
D
DGJ (The Netherlands)
Nice tube amp

It's a nice tube preamp. I use it for streaming music to my active S3000MKII speakers, the sound has now a warm tone. The only problem I have is that the bass button center is not 100% in the center, but it's more 98% in the center.

g
giannisPavlo (Greece)
P3 preamp+ZA3 AMP+arylic streamer

Thanks FOSI for this amazing sound..

W
Warren (United States)
Almost too good to be true

Wow, it is exactly, no better than what I hoped for. (Since it also is a Bluetooth receiver) I was looking at a Marantz tubed preamp KIT for $150, they were going to charge me $75 for shipping and then I’d have to assemble it! Oh and it sounds great and gives me an RCA in a case I ever get a CD transport. I have thousands of them but honestly only listen to my phone . Thanx you I highly recommend anything y’all make and sell.

F
Francois (South Africa)
P3 xmas gift...

After receiving my P3 Xmas gift on the 9th of Jan 2025 it has taken a while to set it up for use.

Yesterday 12 Feb 2025 was the first time that I could really test and enjoy the unit.

I am amazed at the quality of the sound stage that it creates.

Yes it is made to run with the V3, but I added it in between the ZD3 and ZA3. There I could hear the difference between the XLR and RCA outputs.
I was very impressed with the results and the awesome warm sound.

I will do further tests with my V3 and P3 while using the ZD3 as the DAC.

S
Shane (United Kingdom)
Simply amazing preamp with a mind blowing sound system

Thanks to FOSI Audio staff for all your help creating my dream setup. I was advised to add the P3 PreAmp to my second BT30D Pro, which runs my rear speakers and is fed by the pre-out of my first BT30D Pro. The difference is night and day; everything sounds balanced, and the quality is amazing, when we are listening to music it’s like we have a live band playing in our front room. Everything is so crystal clear.

My front speakers as mentioned also powered by a BT30D Pro, with the input coming from my TV’s optical port via a DAC, then through a CYP delay unit to synchronize all the speakers. This setup allows me to run my soundbar, which has two fronts, two rears, and a sub, alongside the two BT30D Pros. Altogether, I have 8 speakers, 4 subs, 2 BT30D Pro Amps, and a P3 PreAmp connected and synced to my TV.

The setup from here involves two passive speakers and a passive sub connected to my first BT30D Pro. The pre-out goes into my P3 PreAmp, then into my second BT30D Pro, which runs two passive speakers and a powered sub in my front room. The passive sub output goes to a sub in the room directly above to block out noises from my noisy neighbours. They have an industrial combined dryer/washer attached to our front room wall. After kindly asking them to move it and being told to go stand in the garden while it's on (tricky when it's on nearly all day until 9 pm), I devised this setup to completely block their noise. Now we can enjoy watching TV again.

The system as a whole exceeds my expectations, and I am thrilled I chose FOSI Audio for my amplification and pre-amplification needs. Having previously DJed with Electro Voice ZLX-15P’s, I can confidently say the FOSI Amps offer far higher quality sound. You can hear every note, and they definitely blow the cobwebs away. If we turn them up, you can feel the wind from the speakers as the FOSI amps are incredibly responsive. The clarity is unparalleled. I am extremely pleased, and I had to write this review to thank the FOSI staff team. You are amazing, and I wish you all a very Happy New Year.

I've also made a short video, which I sent to FOSI Audio, showcasing how my setup turned out. They've told me it will be added to the FOSI Audios shorts section on their YouTube channel, which is an honor. The video is too big to upload here, but I'll share some pictures. Thanks again from a very satisfied customer who will definitely be back.

z
zoxy1955@gmail.com (Serbia)
P3

I have been using the Fossey P3 Preamplifier for a few months now and I am very happy with it. I have connected 2 systems and 2 pairs of speakers to it via the LC 30 VU meter.
I use it occasionally when I listen to vinyl LP BOX X2.
I expect Fosey to release a Preamplifier with a turntable input and an RCA input for other devices so that I don't have to use 2 preamplifiers...

R
Robert (United States)
Fosi P3 Tube Pre-Amp

If you're into tube rolling, this little miracle is hard to beat. Removable tube rings make swapping tubes easy. RCA & Bluetooth input. I bought two, one as a nightstand headphone amp & one paired with four Fosi V3 Monoblocks to bi-amp my Wharfedale 85's.

N
Nola (New Zealand)
LOVE these amps!

Love these and have bought four now! One for my car and one for every room!

Z
Zoltán (Hungary)
the really needed v3 update

My V3 amp was love at first hearing, but every now and then I felt the need to add a little more bass or treble depending on what I was hearing. P3 is very good for this. The tube was a plus for the sound nature, which I can't describe, but I love it. Bluetooth is much better than other cheaper adapters. The design together with v3 is very good. It's just that the updated orange button on the P3 is a little bigger than the original black one, and as I turn it, it scratched into the housing, it's really only 1-2 tenths of a millimeter from the outer diameter, but it should be smaller by that . Due to this small mechanical deficiency, it is uncomfortable to adjust the volume on the preamplifier, so I might anodize the original to the same color, because the design requires it.

A
Anonymous (United Kingdom)
Born as a natural partner for V3

A very good preamp, good channel separation, warm and natural sound reproduced and could hear no hiss from it.

J
James (United States)
Fosi AUDIO P3

Cute. Does what it is supposed to do. Fair price. Difficult to insert tubes. Overall satisfied.

K
Kendi (United States)
Fosi Audio P3

The Fosi Audio P3 is an exceptional budget tube preamp that brings genuine analog warmth to any desktop audio setup. Paired with a mini power amp like the Fosi V3, it creates a visually striking and musically engaging stack.
Key Highlights

A
Alvaro (United States)
Fosi audio P3 tube preamplifier

This is an excellent component , well build and sound excellent conected to fosi amplifier . I enjoy the clean sound and highly recommend this pre amp

H
Henry (United States)
Awesome love it

Great device looks great and works very well .

T
Tony (United States)
Good sound and terrific value.

I use my P3 to feed Bluetooth signals from my phone, and line inputs from an Amazon Echo, into my home sound system. It’s easy to connect, stable, and sounds good. Meets my expectations completely.

J
JP (United States)
Love my tube amp

Got it a couple days go, I love it. Works great with the V3 amp I got in a bundle.

E
Eric (United States)
Great sound

Very clean sounding

D
David (United States)
Great things come in small packages

Wonderful little pre-amp! Very quiet noise floor, and does not appear to inject problems of any kind. I am not sensing a lot of harmonics from the tubes. But they are being used as buffers, so that is to be expected. The bass and treble adjustment envelopes/curves feel very good. Honestly, Fosi are creating great value for dollar and the P3 is a great example of that.

W
Watt (Thailand)
Product not Proper QC

One of Vacuum Tube not working, must find on local shop for replacement

J
Jørgen (Greenland)

Fosi Audio P3 Tube Preamp with Bluetooth aptX LL HD Bass and Treble Tone Controls

M
MaR (Singapore)
P3 tube preamp

Everything fine...

M
Mark (United States)
Great preamp

I use this preamp to either connect to my phone via bluetooth for my music, or connected via mini jack to rca from my pc. Im glad they use these tubes which is i know its sort of hard to discern but i do feel these tubes sound cleaner. So for my pc, i just have some maudio powered speakers and its easy to flip the toggle to switch between bluetooth or rca input. Bluetooth pairs quickly and will pair automatically after that so its easy. Sound clarity is great and if you have good speakers can sometimes hear more detail then you have heard from that music before. So overall, a great small audio interface great to add a bluetooth interface to existing stereo, or just a compact audio interface for your pc. Works well with a fosi amp to power passive speakers as well. Love the compact size and glow of tubes on my computer desk.

S
Simon (Australia)
Great for my Van Audio

I previously installed an Ecoxgear SE26 on the rear tailgate of my van. Used Bluetooth from my phone to stream the music. The sound was very difficult to get right and just didn’t sound very good. Decided to pop in this little preamp and wow what a difference. This little unit turned a very mediocre system into a fanatastic sounding one. The tone controls help tune the sound to the ambient noise of the van when travelling and adds such great depth and warmth overall. You should 100% use one of these as in the scheme of things it’s not an expensive addition and punches well above its weight. I just wired the power of the preamp into my 12v battery system in the van which uses a Victron DC to DC converter for stable voltage control. Thanks Fosi!

D
Douglas (United States)
V3

This amp pounds. Well worth the money.

Select your country or region