@AudioCats no it's not that bad at all. Great price point - it feels solid-ly built (like a tank), and sounds great when on point (tubes with no hum). I mean I started out with the HD6XX/650 and the DV was the only amp in this price point I was able to try that was "stars aligned super magical" sound with those headphones versus any hybrid or SS amp. No regrets at all. The DV made me learn a ton more about tubes and amplifier tech and it has been a fascinating ride.
I wish they did do the things as mentioned. I wonder if when they were designing or updating the 336, it's centered to run with their baseline operating specs: 220 and stock Chinese tubes. Anything that deviates from that - well you know anything can happen.
I think that maybe it is a pretty good litmus test of an amp - if it can take Russian tubes free and clear - I wonder if that is a good sign of the amp build/implementation. It was irritating for me on the DV to put some Melz/Fotons/Fonon and hear it could sound really really great but held back by the amp itself due to noise or hum.
So to that effect -
@Paladin79 when you were designing the Incubus, I know you had it in mind to bring out the best out of the 6SN7 tube - did you have specific tubes in mind when you were building/tuning the amp as a baseline?