the PHs would have given a significant contribution to the above sound improvement that you experienced - irrespective of the headphones under test.
I did hear the 007s with both the Mullard tubes and the Psvanes. I didn't write about it as I would intend to use the PHs only if I had the 009s and the BHSE.
With the 007s, the PHs did tame the treble energy a bit to my ears, and the Mullards gave a boost to compensate for the perceived lack of upper treble response in the 007s.
It was debatable which was best, Psvane smoothness, or Mullard treble lift? I was not sure.
By the time I got to this stage, I had fallen for the 009s and was focused on that for the last 45 minutes of the demo.
I am of the opinion that, to put a 5.5k amp in front of the 007s was good, but didn't hit the right spot. It was well behind the 009s in all respects.
So much so, I would even say the 009s with my 717 sounded better to my ears than the 007s with the BHSE and PH tubes or Mullards.
Possibly I really liked the 009s presentation? I have a tubed DAC so I can see I will be ok with the extra treble energy or removal of the 007 veil
so to speak.
I can report back in 2 months time once I get back to Spain and hook up my front end to the incoming 009s.
I think the front end in so important at this level. The treble quality is so important and to me has the biggest impact - making or breaking everything else
that may be good or great about the SQ on offer.
I also think folk need a good session with the 009s. The brain does adjust to the different presentation from the 007s, First off it seems a bit bright,
but actually it is the amount of detail that is coming through. This might also be why some think the bass is lighter on the 009s to the 007s. In my view
the 007 has a bloomier bass, or a slight bloat in the mid bass, that sounds like extra energy but actually isn't. The bass on the 009 is right there to hear,
and is very fast, on or off fast, no overshoot, no bloat.
I hope this helps. It is so difficult to describe in words. I just got an emotional connection with the 009s, and though I love my 007s, it was for me
the full story on offer, great e-stat attributes (as the 007) but also a presentation to a higher level than I have heard before.