Finished the preamp build yesterday, still have one power supply to build though. That is the benefit of the Christmas holidays as you have some proper time to work on your projects.
Magically this time all worked fine from start. The preamp measures really well using the noisy bench power supply:
As expected the HF response is really good thanks to the design of this stage. The -3dB pole is above 100kHz. LF response is actually better than the shown above as the soundcard LF pole is playing as well.
From a distortion point of view the preamp is performing well at maximum level which the Starlight discrete DAC will be playing at (i.e. 400mV):
The nice decay of harmonics is characteristic of this fantastic DHT.
