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QSX Mark III - The extreme phono (RIAA) amplifier

 

 

 

Click on the picture to get a larger view. The printed circuit board of the QSX Mark III Amplifier.

Interesting features

In order to get an extremely linear and extremely low distortion design I have taken a couple of measures:

  1. No capacitors in the signal paths
  2. Totally DC-coupled together with DC-servo
  3. The opamp is biased into class A with a JFET or bipolar transistor.
  4. Many decoupling capacitors and EMI-filters
  5. Powerful output buffer, intergrated or discrete, your choice.
  6. Power supply on the board, just add AC voltage.
  7. Professional quality printed circuit board with groundplane.
  8. The pcb has lot's of possibilities when it comes to tweaking.