The ESS AMT will shine when played using a high current solid state amp, but they don't do nearly as well on tubes.
In these videos, I went to extremes to match the volumes and the Vanessa track is within 0.1 dB while the SRV track is within 0.5 dB, both in favor of the Melton. Everything else is held constant.
Vanessa on solid state:
Vanessa on tubes:
Stevie on solid state:
Stevie on tubes: