Nobsound 6J9 Vacuum Tube Integrated Amplifier Review

The Nobsound 6J9 Vacuum Tube Integrated Amplifier is one of the most popular tube amplifiers on the market. This is because it comes in a small and simple package yet is capable of producing high fidelity sounds. It is proven to provide the great performance that audiophiles crave.

It is also designed to easily power high performance headphones and comes with 3.5 mm input and output jacks.  Despite the many great features, it is sold at a lower price, making it a top option among consumers including those with limited budgets, and one of the best tube amplifiers under $400.


  • Dimensions 6.1×4.9×3.7 inches
  • Weighs approximately 12.8 ounces
  • Features a straightforward and simple yet functional design
  • Made of durable and high-quality materials
  • Output power of 32 ohm
  • Offers a headphone adapter impedance of 18-600 ohm
  • Proven to lower total harmonic distortion to about 0.005%
  • Includes a large gold-plated volume control knob
  • Equipped with a single gold-plated 3.5mm input and output jacks
  • Fitted with a big red power button at the back of the device
  • Equipped with two 6J9 vacuum tubes
  • The tubes can be replaced by E180F, 6688, 6ж9П and EF861
  • Works well with high-performance headphones like the HD 580, HD 600, HD 650, Q 701, K 701, and K 702
  • Includes a power supply

3 thoughts on “Nobsound 6J9 Vacuum Tube Integrated Amplifier Review”

    • Hey There, James!
      I did the same thing…broke a tube. It seems the 6J9 vacuum tubes need to be replaced with the American-sold 6688/E180F types. I had to order these online, and they were around $12 Dollars each. Good luck in your search, and hope this helps you!

  1. Open it : there are OPA 5532 inside ? I don’t understand why transistors in a tube amp ?? I don’t understand well electronic but I have an amplifier with equivalent OPA and NO tube !!!

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