Power amp/integrated amp suggestions for SUPER POWER HUNGRY/INEFFICIENT SPEAKERS

That’s a great price for that amp. It also has the virtues of being bulletproof, the designer still supports it and answers questions on the phone, and you can upgrade it later if you want even more. I’ve had my 0.5 Rev A for 20 years. You won’t be disappointed.

Frankly, you'll probably get a a lot more out of this amp and your speakers by eventually upgrading to a better preamp.  Here's a quote from the 6moons review of the Tyr using it as a preamp...

"Clearly the core target audience are headfiers. Those who also run speaker systems are well advised to give the Lyr a go. But I'd not recommend that preamp buyers pursue the Lyr as primary target."

So while the Tyr may serve the purpose for now, you can look forward to potentially significantly better performance down the road with a better preamp as funds allow.  Preamps have a huge impact on ultimate system performance.   Anyway...

@soix Thank you for that. Let it be said that I have the option of selling the Lyr2 + a pair of headphones for ~$1000, of which some (or all) could go to a proper preamp. I'm not really using that piece of gear any more, and have been planning to part ways with it for a while.

Somethings in Audio are built to a price point . Some are built to what the sucker will pay .

Soix, I live in the boonies and never heard a McCormack.  But in years of reading A'gon I have never heard anything but praise for them, not one negative thing..

I think you did well with the McCormack DNA 0.5. Check out Brown Audio Labs for a tube preamp. Also Quicksilver. I believe both offer new models at $1000. Other might appear used under that figure.
Good luck!