Hi folks
Hope you don't mind me piping in here. The HP is the exact same amp as the DiaLogue Premium in every way, with these additions:
Larger power transformer, additional circuitry to add four more power tubes including an additional Adaptive AutoBias board, and the headphone amp which I will comment on later. The benefit is more power and a lower output impedance which will give it a little more slam and control. Not a ton more. But more. So the HP is an all-out attempt to make an integrated that truly will smoke the most expensive separates. We could have increased power for a cost of maybe $2 by simply raising the plate and screen voltage of the tubes and bias them hard like the rest of the world, but our mission is to try to eliminate tube maintenance by running the tubes at minimum dissipation without going into crossover distortion.
The 36 watts that the DiaLogue Premium has is huge because we concern ourselves with bandwidth in the output transformers, not power. As evidenced by John Atkinson's review of the YG Acoustics Carmel 2 loudspeaker where he preferred our amp's bass performance (and sound overall) over 400 watt Parasound Halo monoblocks and $25,000 MBL Coronas. You can read his comments on the PrimaLuna website.
The headphone amp of the HP is amongst the best I've ever heard. As good as my German Malvalve which costs so much more. In fact better, except if the headphones are super high impedance. The implementation is unique the way we did it.
I'm really happy that beyondarkness loves his DiaLogue One so much after so many years. While other companies certainly want you on the merry go round burning cash, our desire is to create amps that are iconic and relevant 10, 20, or even 50 years from now. It makes me smile when I get calls from people ten years later that they are still happy.
Having said that, the new series DiaLogue have the exact same output transformers which is where the magic happens, but with a myriad of improvements that for sure will increase performance. In a side by side with the same tubes it will become apparent, but I'm going to tell you the original DiaLogue One, Two, ect were so good I thought we had painted ourselves into a corner.