https://dl.dropboxusercontent.com/u/86116171/MDAC2 -60dB 132dBA DNR.jpg
Above is an FFT of the MDAC2's analogue stage attached to JariP
Salvaged MDAC
Dynamic range 132.5dBA (Balanced) and THD 0.000087% 1KHz 0dB!
This Dynamic range result is close to my all time personal best - I believe the MDAC2 will have the highest Dynamic range performance in the industry (it will improve by a few more dB on the final PCB)...
There is a chance that the THD results will improve further once I have the complete design... although 0.000087% its amongst the very best already.
With the VFET AMPs, I'd really like to include internal gain scaling to maximise the dynamic range offered by the MDAC2 - the Tube noise looked good at about -120dB... (Which is good for a tube)...