The Fosi Audio P3 is a tube preamplifier and headphone amp with two 5654W tubes, Bluetooth 5.1 (Qualcomm QCC3031 with aptX HD and aptX LL), an RCA input and RCA, AUX and 3.5mm headphone outputs. It suits adding a tube stage and wireless streaming in front of a power amp or powered speakers.
Who the Fosi Audio P3 is for
Adding tubes to a system: Two 5654W tubes run at up to 54V, per Fosi, between your source and a power amp or powered speakers.
Wireless streaming: A Qualcomm QCC3031 Bluetooth 5.1 chip supports aptX HD and aptX LL, with latency as low as 40ms, per Fosi.
2.1 setups: The RCA and AUX outputs work at the same time, so one can feed an amp or powered speakers and the other a powered subwoofer.
Headphone listening: The 3.5mm jack drives 16–300Ω headphones with 150mW @ 32Ω; plugging in mutes the RCA and AUX outputs.
Skip it if: You need a digital input; the P3 takes Bluetooth and RCA only, so USB, optical or coaxial sources need a separate DAC.
Fosi Audio P3 key specs
Type: Tube preamp and headphone amp with 2 × 5654W tubes, replaceable with 6J1, 6J4, 6AK5 and similar 7-pin types
Tone controls: Treble ±6dB, bass ±12dB, center detents
SNR / THD: ≥103dB / ≤0.02%; crosstalk 95dB
Frequency response: 20Hz–20kHz (±1dB)
Power: 12V/1.5A adapter included; accepts DC 12V/1.5A–3A
In the box: P3 preamp, 2 × 5654W tubes, Bluetooth antenna, 12V/1.5A power supply, user manual
Genuine Fosi Audio stock. Free shipping on every order, 45-day returns.
Fosi Audio P3 vs similar options
vs Fosi Audio GR70: Adds a Class A OTL design with four tubes, 6.35mm and 3.5mm jacks and up to 300mW @ 32Ω; pick the P3 for Bluetooth 5.1 with aptX HD and aptX LL.
vs Fosi Audio SK01: Adds a battery-powered Class A design with up to 2,400mW at 32 ohms and a three-band EQ; pick the P3 for a tube preamp stage, Bluetooth 5.1 aptX HD and RCA in and out.
Yes. Every unit we sell is genuine and brand-new, shipped in its original packaging, and backed by our 1-year TonePier warranty and 45-day returns.
Where does my order ship from, and how long does it take?
Every order ships from our warehouse in China, with full tracking, and most orders ship within 3 business days. Shipping is free on every order; most US orders arrive within 7–15 business days and most orders to other countries within 7–20 business days — see our shipping policy for details.
What if it isn't for me?
You get 45 days to decide. Keep the packaging, keep it in like-new condition, and send it back for a refund. Ear tips unsealed for hygiene reasons are fine — we expect you to actually listen.
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