There’s a Plinius SA-102 for sale on US Audio Mart for $2395 that’s older and heavier than your desired specs and lacks an input trigger. It also “only” puts out 125Wpc (but those are pure Class-A Watts so that’s likely plenty of juice), and it’s 8.75” high so won’t quite fit in your rack. So looking back the 102 only ticks 3 of your 7 boxes, but the sonics may be worth bending some of the rules. However, if your CJ amp is a Premier 350 that might be tough to beat. Best of luck.
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I don't find CJ amps, at least the old ones, to be voiced or sound anywhere like a MC.
Buy what you like, but listen before you get enamoured. I'd recommend Luxman, but not sure you are going to get anything lighter! :)
Also, give the Bel Canto Class D amps a shot. I think that in terms of tonal balance, you may find it closer to your CJ's. They won't sound the same, of course, but tell me what you think.
You may try Crown XLS 2502 which sounds neutral but with fast transients.
I had good result with power hungry Raal Sr1a headphone.
Now I am using two of them as bridged (2400 watts for 4 ohm) to drive two 18 inch Scaena subwoofers.
With generous Amazon return policy, you can return in 30 days if you do like it.
It will sound better after having 24/7 on for at least a day.
Thanks for the advice. FWIW, I have been looking for several months at the newer class D modules, and decided to put my money on a Nord Acoustics dual mono 1et400a class D amplifier. It fits my main criteria, albeit I know not to expect a "McIntosh" sound, which is alright for now. That module is relatively new from Purifi, has a very high efficiency, and scores quite well on the bench. Listeners seem to like the Nord design with the choice of input filter OpAmps (I chose the Sonic Imagery 990Enh), but the proof will come once it's installed and operating in my system. I'm certain I'll revisit the McIntosh-Mark Levinson heavy weight amps sometime in the future, depending on how my back is feeling (lol). Wish me luck, and again thanks for your comments.
I received and set up my Nord dual mono 1ET400A amp yesterday. After ~8 hours of listening, I'm very satisfied with the sound reproduction. What a vast difference in the sound stage when compared to my CJ amp. The one-page manual said that the amp will break in over an extended period perhaps exceeding 100+ hours. I'll make a note to revisit this post with an update.
Oh, less I forget: it is _so_ nice to have a light-weight amp that can be moved with ease!