Luxman owner here. Two others you should listen to are Arcam and Ayre.
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I don’t own one but extensively heard the Mark Levinson 5805 integrated at a local hi-end shop driving both Magico and Sonus Faber speakers. It sounded so good that I bought a fairly expensive pre-owned ML 326S preamp just to try and capture some of the 5805's excellent qualities in my system, I was told the 5805 basically incorporated the 326S as its preamp section. It worked like a charm even though I use high powered class D mono-block amps and Magnepan 3.7i speakers in my system.
The main qualities I was attracted to were the 5805’s very well defined 3 dimensional soundstage it presented, its high levels of neutrality and detail along with its palpable and natural perception that the musicians were in the room, or being transported to the venue, depending on the recording.
However, it may not be warm enough for your tastes and pre-owned prices are likely well beyond $2K. But it matches your power and weight requirements and it sounds spectacular.
Have a look at Marantz PM10 which doesnt get much love and I can't understand why. Makes no sense, it's really good. For the prices you can buy used it is crazy good. Been running it for two months and I am very impressed. Love the class D, no heat, very detailed and smooth at the same time. Great transparency and thunderous bass. It is really good.
Take a look/listen to BAT VK3000SE. It meets your requirements except for two tubes on the input side. I use mine with Sonus Faber Cremona floorstanders. It outperforms my prior integrated, a Hegel H200, and performs well compared to my previous separates including Pass, ARC and Pass Labs. Music Direct carries them as I believe they took a financial interest in the company a few years back.
Thank you all so much! With your help I've got few important ideas for my search and models to look for and listen. But I'm still wondering if anyone has experience with mentioned Gryphon models? There are few realistic reviews of Diablo's, but not so much about Atilla and Callisto, plus the fact that Gryphon name itself is somehow mystic meaning that all references are great, but mostly from reviewers...
I don’t believe you are going to find many of these amps second hand for 4K. I’m amp testing right now. I heard the Hegel 390. It ticks all your boxes. 6k new. I’m hearing the Mark Levinson 5805 and the Krell 300i today. Those would have to be 50% off the new price to be 4k. Gryphon? Good luck. Pass INT60 is 11k new. Luman 507 a possibility and a nice amp. Accuphase was too polite for my taste and Mac is not not warm and super open, at least in your price range. Parasound and Unico Research meet your requirements from what I’ve read but not heard them.
Gryphon Integrated Diablo 120 or 300 if you can stretch it, you won’t look back with either of those driving the SF Guarneri, and they’ll drive anything in the future if you ever go bigger with the speakers.
Diablo 120 https://6moons.com/audioreviews/gryphon/hero.jpg
Diablo 300 https://cdn.shopify.com/s/files/1/2788/2378/products/0_0_0_0_70__Reviews_ScreenShot03338_1024x1024.j...
Here is my problem with Pass Labs, I think they make some of the best sounding, most reliable amps out there, that will also drive 90% of all speakers and they remain very musical while doing so, but, after owning their XP20 and XP30 preamps for 2 years each, I find their preamps are just mediocre at best. I would try to find a good used XA30.8 because it’s a giant killer and save up more money for a good tube preamp. You will be so happy you did. Good luck!