AliExpress.io
Nobsound P7 Valve Tube Phono Stage Preamp Stereo Pre-amplifier with HPF for MM Turntable Treble&Bass Control

Nobsound P7 Valve Tube Phono Stage Preamp Stereo Pre-amplifier with HPF for MM Turntable Treble&Bass Control

4.817+ sold
$119.76$202.99
41% OFF
Buy on AliExpress

You will be redirected to AliExpress to complete your purchase

Specifications

Brand Name
nobsound
High-concerned chemical
None
Maximum Power Per Channel
NO POWER
Origin
Mainland China
Package
Yes
Channels
2 (2.0)
Certification
CE
Model Number
P7

Product Description


Features

  • MM Phono/RCA Input Flexibility: Serves as both a phono preamp and tube preamp, P7 is perfect for connecting turntables, phones, TVs, CD players etc. The P7 enhances sound clarity while adding a warm tone, bringing out every detail in your favorite music.

  • XLR Output for Pristine Audio: Besides standard RCA, the P7 features a true balanced XLR output, reducing noise and improving dynamic range. Perfect for amplifiers and active speakers, it delivers crystal-clear audio with a wider soundstage, ensuring distortion-free, immersive sound. 

  • Clearer Vinyl Playback with HPF: The integrated high-pass filter (only available in phono input) cuts off subsonic noise below 20Hz, reducing distortion and improving sound clarity. It ensures a cleaner playback, making your records come alive with reduced rumble and better dynamics.  

  • True Tube Amplification: Powered by brand-new PSVANE ECC83 tubes, easily swappable for tailored sound, the P7 brings warmth and sweetness to your audio. Driven at 180V, the tubes unlock the full potential of analog sound, offering a rich harmonic depth that audiophiles will appreciate.

  • Precise Tone Control with Bypass : Fine-tune the bass and treble for a customized sound profile, or engage the bypass mode for pure, unaltered audio. Whether you’re adjusting the tone or listening to the original signal, the P7 gives you full control over your listening experience.

Q: What is the input voltage of the P7?
A: The P7 operates at DC 12V/≥2A. Using over voltage can cause damage, while insufficient current may affect normal operation.

Q: Can I connect a turntable directly to the P7?
A: Before connecting, please check if your turntable has a built-in phono preamp. If so, use the RCA input to avoid unwanted noise.

Q: Can the RCA and XLR outputs be used at the same time?
A: Yes, they output at the same time, with their volume and tone controlled simultaneously.

Q: Is the high-pass filter active in RCA input mode?
A: No. The high-pass filter is only available in phono input mode.

Q: Can I swap op-amps in the P7?
A: Yes, the P7 features 3 pluggable NE5532 op-amps, which can be replaced with other dual op-amps such as 2604, 2134, or MUSES02 etc. High voltage inside, please make sure the op-amp is properly installed before powering on.

Q: Can I replace the tubes in the P7?
A: Yes, the P7 supports swapping for PSVANE 12AX7-S, Shuguang 12AX7B, 7025, or 12AX7 tubes. Please replace tubes when powered off.

Parameters

  • Brand: Douk Audio

  • Model: P7

  • Audio input: MM Phono / RCA

  • Audio output: RCA / XLR

  • Input sensitivity:

    • Phono input: 5mV

    • RCA input: 0.775V

  • Rated output level:

    • Phono input: RCA output: 0.5V / XLR output: 1V

    • RCA input: RCA output: 2V / XLR output: 4V

  • THD+N:

    • RCA input: 0.1%

    • Phono input: 0.03%

  • SNR:

    • RCA input: ≥109dB

    • Phono input: ≥82dB

  • Frequency response:

    • RCA input: 20Hz-20KHz (±0.8dB)

    • Phono input: conforms to RIAA characteristics

  • Treble/bass range: ±6dB

  • High-pass filter cut-off frequency: 20Hz

  • Input voltage: DC 12V≥2A (5.5*2.1mm)

  • Dimensions (W*D*H): 155*124*42mm / 6.10*4.88*1.65in

  • Package dimensions (W*D*H): 310*240*70mm / 12.20*9.41*2.75in

  • Net weight: 707g / 1.56lb

  • Package weight: 1.10kg / 2.43lb

Packing list

  • 1* P7 Preamp

  • 2* PSVANE ECC83 Tubes

  • 1* DC 12V Power Adapter

  • 1* User Manual



Pros & Cons

Pros

  • Dual functionality as both a phono preamp and tube preamp for versatile device connectivity
  • Includes XLR and RCA outputs for flexible audio connection options
  • Adds warm, rich tube-based sound tone while enhancing overall audio clarity
  • Features adjustable treble, bass, and HPF controls for custom audio tuning

Cons

  • No maximum power output details are listed in the product specifications
  • Partial product description cuts off key functionality and sizing information
  • No physical dimension details provided for planning placement or storage

Common Questions

What audio devices is this Nobsound P7 phono preamp compatible with?

It works with MM turntables, smartphones, TVs, CD players, and more, functioning as both a phono preamp and a standalone tube preamp.

What sound tuning controls does this preamp include?

It features adjustable treble and bass settings, plus a high-pass filter (HPF) to customize your audio output.

What audio outputs does this phono preamp offer?

It provides XLR outputs for high-quality pristine audio, plus additional RCA connectivity options as noted in product details.

What packaging is included with this preamp?

The unit ships with a standard included retail package as specified in the product specifications.

Does this preamp meet global safety certification standards?

Yes, it holds CE certification for safety and quality compliance for sale in applicable European regions.

Product information last updated on November 26, 2025

Back to Home Audio & Video