I can't help much here by way of comparison as I have only heard a VAC power amplifier. Incidentally I also shortlisted VAC with Ayon, Conrad Johnson, and Rogue Audio (their new pre's are very interesting) in my search for a new pre-amp.
What I can tell you is that that I have the Ayon Eris and it is absolutely fantastic. On a general note I think the 6H30 is better than the 12AX7 and not only because it has more tube warmth.
What I can tell you is that that I have the Ayon Eris and it is absolutely fantastic. On a general note I think the 6H30 is better than the 12AX7 and not only because it has more tube warmth.