How do alpha VHD preamplifiers (SSL Alpha VHD Pre) compare with Superanalogue preamplifiers as used in the X-Rack's XR621 Mic Amp module?
The Alpha VHD analogue and Superanalogue circuits have been created by the same team of engineers and share some design similarities.
However, they are not the same. The VHD adds coloration and musical harmonic content, dependent on the input signal level.
SuperAnalogue pre-amps are completely transparent, ultra low noise, ultra low THD designs for pristine audio.