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Douk Audio P7 HiFi Tube Phono Preamp with High-Pass Filter Review

A tube phono and line preamp with PSVANE ECC83 tubes run at 180V, MM phono and RCA inputs, a subsonic high-pass filter for vinyl, and both RCA and true balanced XLR outputs.

3.73.7 out of 5 starsUpdated October 14, 2026
$109.99Price checked October 14, 2026
Check price at Douk Audio
Douk Audio P7 HiFi Tube Phono Preamp with High-Pass Filter

Our verdict

The Douk Audio P7 covers both halves of an analog front end for $109.99: an MM phono stage with a 20Hz high-pass filter for cleaner vinyl, and a tube line preamp with PSVANE ECC83 tubes run at 180V for warmth on digital sources. RCA and true balanced XLR outputs run simultaneously with shared volume and tone, and the 3 pluggable NE5532 op-amps invite upgrades. It is a strong fit for a vinyl-plus-streaming system.

Best for
Vinyl listeners who also stream or play CDs and want one tube stage handling both, with balanced XLR output to an amplifier or active speakers
Skip if
You use a moving-coil cartridge, you need the high-pass filter on line inputs, or you require a confirmed bundled power adapter
Check price at Douk AudioHow we research

The Douk Audio P7 is a tube phono preamp and stereo pre-amplifier priced at $109.99. It serves two roles: a phono stage for turntables and a tube preamp for line sources such as phones, TVs and CD players, adding warmth while bringing out detail.

On the vinyl side, the integrated high-pass filter (available only with the phono input) cuts subsonic noise below 20Hz, reducing distortion and making records play with less rumble and better dynamics. The tube stage uses brand-new PSVANE ECC83 tubes driven at 180V, which the maker says unlocks the warmth and harmonic depth the design is built around; they can be swapped for PSVANE 12AX7-S, Shuguang 12AX7B, 7025 or other 12AX7 types.

Outputs are flexible: standard RCA plus a true balanced XLR output that reduces noise and improves dynamic range for amplifiers and active speakers, with both outputs running at the same time under shared volume and tone control. Bass and treble knobs allow custom tuning, and a bypass mode restores the pure, unaltered signal. Three pluggable NE5532 op-amps can be replaced with other dual op-amps such as 2604, 2134 or MUSES02 — power down before swapping, since the unit carries high voltage inside.

Two setup notes pay off in practice. If your turntable has a built-in phono preamp, connect it to the RCA input rather than the phono input to avoid unwanted noise. And the high-pass filter is active only in phono input mode. The P7 operates on DC 12V at 2A or more; the listing does not state whether an adapter is included.

Shipping is worldwide with free and expedited options, and cost varies by country. This preamp is light, so it ships airmail in an estimated 10-25 days unless expedited service is chosen. Import duties and customs fees are the customer's responsibility. Free 30-day returns with a full refund and a 1-year warranty apply to all items, excluding orders placed by mistake, man-made damage or misuse, subjective change of mind, and anything else outside the warranty terms.

What we liked

  • Two preamps in one: a phono stage for turntables and a tube line preamp for phones, TVs and CD players
  • True balanced XLR output alongside RCA reduces noise and widens the soundstage for amps and active speakers
  • The high-pass filter cuts subsonic noise below 20Hz on vinyl, reducing rumble and distortion in records
  • PSVANE ECC83 tubes driven at 180V aim to unlock the full potential of the analog stage
  • Tone controls with a bypass mode, plus 3 pluggable NE5532 op-amps for easy upgrades

Worth noting

  • The high-pass filter only operates in phono input mode — it is not available on the RCA input
  • It is an MM phono stage; no moving-coil setting is listed
  • The available listing information does not state that a 12V power adapter is included, and the unit requires DC 12V at 2A or more

Questions before you buy

Can I connect a turntable directly to the P7?

Yes, via the phono input and the P7's MM phono stage. Before connecting, check if your turntable has a built-in phono preamp — if so, use the RCA input instead to avoid unwanted noise.

Is the high-pass filter active in RCA input mode?

No. The high-pass filter is only available in phono input mode, where it cuts subsonic noise below 20Hz.

Can I swap the tubes and op-amps?

Yes. The PSVANE ECC83 tubes can be replaced with PSVANE 12AX7-S, Shuguang 12AX7B, 7025 or 12AX7 types (power off first), and the 3 pluggable NE5532 op-amps can be replaced with other dual op-amps such as 2604, 2134 or MUSES02.

What are the shipping and warranty terms?

Worldwide shipping with free and expedited options; light orders ship airmail in about 10-25 days. Import duties are the customer's responsibility. Free 30-day returns for a full refund and a 1-year warranty apply, excluding orders by mistake, misuse, change of mind and anything outside the warranty terms.

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