First of all: GainHead, I know Mikhail knows you (he told me himself), and that you're also local to him. Given what I do know of your background, it would be nice to see you contribute some nuggets of wisdom I'm sure your vocation affords you some knowledge of, especially in matters discussed in the past couple of weeks (should you decide to, please choose the appropriate threads). As it stands now in this thread, if you've nothing on-topic to add, then back off. If you're trying to divert attention away from other issues, then back off. At this point, it appears to me that, at the very least, you're merely trying to further the silly
Ray's fans versus Mikhail's fans lunacy, which I find completely unnecessary.
Secondly, and
on-topic: I don't find the HR-2 to have treble roll-off, even with the AD797 opamps installed. With the AD797's, there is an overall smoothness to the presentation, certainly helped along by what I perceive to be some highlighting of the midband. Despite its smoothness, the HR-2 with AD797's remains pretty detailed. Of course, its smoothness might not find favor with some, but the ability to swap opamps like some swap tubes is a big plus in terms of versatility with the HR-2. Yes, I find the AD797's pleasant, but I do like the greater detail and neutrality provided by the OPA627BP's (while still being smooth, too). If one wants an even greater sense of treble energy, then I can't imagine the AD8065-equipped HR-2 could ever be blamed for being treble-shy (so far the most neutral opamp in the HR-2 to my ears), and
definitely not the AD8610-equipped HR-2, which I find a bit too treble-spotlit for my tastes. A nice, balanced opamp in the HR-2 (to my ears) is the LT1028, which does much of what so many love about the stock AD797's, but with a bit less highlighting of the midband, and, to my ears, a bit more neutrality overall. Long story short, if the question is whether or not the HR-2 is rolled-off at the top,
my answer is no. And, given some myriad op-amp rolling options available, then I feel the answer can definitely be made "no" for just about anyone wishing to find the right opamps for his own ears.
As for the other Ray Samuels amps: I haven't spent much time with the XP-7 or the SR-71, but I have spent some quality listening time with the Stealth (I don't think I've heard it with anything but stock tubes), and if someone says that
that amp has treble roll-off, I'd say I seriously disagree. To my ears, the Stealth is definitely
without treble roll-off, and is quite neutral overall, and with healthy treble extension.